I think the OP is saying he has a function, so it's not a program or an issue of setting the right path. My assumption is that his .profile has a line like:

function pscnt { some_ps_commands_here }
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And he wants that invoked .. But some-what related to your suggestion, my suggestion to him is that he simply make pscnt a program (create a pscnt executable script in /usr/bin or somewhere in the PATH) and then call it.