Staus overview issue

Hi experts,

In status overview MSS Iview, Appraisal.

Manager has an option to select the appraisal form type (ie SHOW dropdown box).

by default (in Standard) in that DD box we have different Appraisal form types, but there is no option like ALL.

So, We need one more option like ALL type. (so that when a manager selects that option, he can view all the appraisal form types Appraisal Form(A.F) 2007+ A.F 2008+ A.F 2009.....).

From where this DDbox gets populated?

where we need to add that ALL option?

thanks in advance.