Exhibit (a)(6)

GLOBAL GROWTH PORTFOLIO

AMENDMENT TO DECLARATION OF TRUST

AMENDMENT effective August 11, 2008, made to the Declaration of Trust dated June 1, 1995,
as amended, (hereinafter called the “Declaration”) of Global Growth Portfolio, a New York trust
(hereinafter called the “Trust”), by at least a majority of the Trustees of the Trust in office on
August 11, 2008.

WHEREAS, Section 10.4 of Article X of the Declaration empowers a majority of the Trustees of
the Trust to amend the Declaration without the vote or consent of Holders to make such changes
as do not have a materially adverse effect on the financial interests of Holders; and

WHEREAS, the Trustees of the Trust have deemed it necessary or appropriate to amend the
Declaration in the following manner;

NOW, THEREFORE, at least a majority of the duly elected and qualified Trustees do hereby
amend the Declaration in the following manner:

1. Section 10.4(a) of Article X of the Declaration is hereby amended and restated in its
entirety to read as follows:

(a)      This Declaration may be amended by the vote of Holders of more than 50% of all
Interests at any meeting of Holders or by a majority of the Trustees and consented to by the
Holders of more than 50% of all Interests. Notwithstanding any other provision hereof, this
Declaration may be amended by a majority of the Trustees, and without the vote or consent of
Holders, for any one or more of the following purposes: (i) to change the name of the Trust, (ii) to
supply any omission, or to cure, correct or supplement any ambiguous, defective or inconsistent
provision hereof, (iii) to conform this Declaration to the requirements of applicable federal law or
regulations or the requirements of the applicable provisions of the Code, (iv) to change the state
or other jurisdiction designated herein as the state or other jurisdiction whose law shall be the
governing law hereof, (v) to effect such changes herein as the Trustees find to be necessary or
appropriate (A) to permit the filing of this Declaration under the law of such state or other
jurisdiction applicable to trusts or voluntary associations, (B) to permit the Trust to elect to be
treated as a “regulated investment company” under the applicable provisions of the Code, or (C)
to permit the transfer of Interests (or to permit the transfer of any other beneficial interest in or
share of the Trust, however denominated), (vi) in conjunction with any amendment contemplated
by the foregoing clause (iv) or the foregoing clause (v) to make any and all such further changes
or modifications to this Declaration as the Trustees find to be necessary or appropriate, and (vii)
to change, modify or rescind any provision of this Declaration provided such change,
modification or rescission is found by the Trustees to be necessary or appropriate and to not have
a materially adverse effect on the financial interests of the Holders; provided, however, that
unless effected in compliance with the provisions of Section 10.4(b) hereof, no amendment
otherwise authorized by this sentence may be made which would reduce the amount payable with
respect to any Interest upon liquidation of the Trust and; provided, further, that the Trustees shall
not be liable for failing to make any amendment permitted by this Section 10.4(a) . Any
amendment to the Declaration of Trust shall be effective as provided by its terms or, if there is no
provision therein with respect to effectiveness, (i) upon the signing of an instrument by a majority
of the Trustees then in office or (ii) upon the execution of an instrument and a certificate (which

may be part of such instrument) executed by a Trustee or officer of the Trust to the effect that
such amendment has been duly adopted.

* * * * *

IN WITNESS WHEREOF, the undersigned certifies this amendment has been duly adopted at a
meeting of the Board of Trustees held on August 11, 2008. Signed this 15th day of September,
2008.

/s/ Maureen A. Gemma
Maureen A. Gemma
Secretary to the Trust