Exhibit 1.(h)

                    ESTABLISHMENT AND DESIGNATION OF CLASSES
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                      MERRILL LYNCH INTERMEDIATE TERM FUND
                     OF MERRILL LYNCH MUNICIPAL SERIES TRUST


         Pursuant to that certain Establishment and Designation of Classes
amended and restated as of October 17, 1994 (the "Prior Designation"), the
shares of beneficial interest of Merrill Lynch Intermediate Term Fund, a series
of Merrill Lynch Municipal Series Trust, a Massachusetts business trust (the
"Trust"), par value $.10 per share (the "Shares"), have been divided into Class
A, Class B, Class C and Class D Shares as named in the Prior Designation. The
undersigned, constituting a majority of the Trustees of the Trust, acting
pursuant to Section 6.1 of the Declaration of Trust of the Trust, dated August
14, 1986 as amended (the "Declaration"), do hereby amend and restate the Prior
Designation as provided herein, for the purpose of redesignating the Class A
Shares and Class D Shares. No changes to the special and relative rights of the
existing classes of Shares are intended by this amendment and restatement.

          1.(a)  The Class A Shares are hereby redesignated "Class I Shares."
                 The Class I Shares shall retain all of the rights and
                 preferences accorded to the Class A Shares prior to this
                 redesignation.

            (b)  The Class D Shares are hereby redesignated "Class A Shares."
                 The Class A Shares shall retain all of the rights and
                 preferences accorded to the Class D shares prior to this
                 redesignation.

            (c)  The other existing classes of Shares of the Trust are
                 designated "Class B Shares" and "Class C Shares."

          2.     Class I Shares, Class A Shares, Class B Shares and Class C
                 Shares shall be entitled to all of the rights and preferences
                 accorded to Shares under the Declaration of Trust.

          3.     The purchase price, the method of determination of net asset
                 value, the price, terms and manner of redemption, and the
                 relative dividend rights of holders of Class I Shares, Class A
                 Shares, Class B Shares and Class C Shares shall be established
                 by the Trustees of the Trust in accordance with the provisions
                 of the Declaration of Trust and shall be set forth in the
                 currently effective prospectus and statement of additional
                 information of the Trust relating to each series of the Trust,
                 as amended from time to time, contained in the Trust's
                 registration statement under the Securities Act of 1933, as
                 amended.

          4.     Class I Shares, Class A Shares, Class B Shares and Class C
                 Shares shall vote together as a single class except that shares
                 of a class may vote separately on matters affecting only that
                 class and shares of a class not affected by a matter will not
                 vote on that matter.

          5.     A class of shares of any series of the Trust may be terminated
                 by the Trustees by written notice to the Shareholders of the
                 class.

          6.     This Establishment and Designation of Classes shall be
                 effective as of 8:00 a.m. on the 14th day of April, 2003.




         IN WITNESS WHEREOF, the undersigned, constituting a majority of the
Trustees, have signed this certificate in duplicate original counterparts and
have caused a duplicate original to be lodged among the records of the Trust as
required by Article XI, Section 11.3(c) of the Declaration of Trust as of the
______ day of ___________, 2003.




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         Terry K. Glenn                                Ronald W. Forbes
 (President/Principal Executive                           (Trustee)
        Officer/Trustee)




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     Cynthia A. Montgomery                            Charles C. Reilly
           (Trustee)                                      (Trustee)




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         Kevin A. Ryan                                Roscoe S. Suddarth
           (Trustee)                                      (Trustee)



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        Richard R. West                               Edward D. Zinbarg
           (Trustee)                                      (Trustee)



         The Declaration of Trust establishing Merrill Lynch Municipal Series
Trust, dated August 14, 1986 a copy of which, together with all amendments
thereto (the "Declaration"), is on file in the office of the Secretary of the
Commonwealth of Massachusetts, provides that the name of the Trust, "Merrill
Lynch Municipal Series Trust," refers to the Trustees under the Declaration
collectively as Trustees, but not as individuals or personally; and no Trustee,
shareholder, officer, employee or agent of Merrill Lynch Municipal Series Trust
shall be held to any personal liability, nor shall resort be had to their
private property for the satisfaction of any obligation or claim or otherwise in
connection with the affairs of said Trust but the "Trust Property" only shall be
liable.



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