I have a function on current sheet which refers to cells on other sheet
PSUML5'!F15 ie. Cell F15 on Sheet PSUML5

When I cut or copy this current sheet to another sheet, it still refers to
the original sheet
='[Build Summary - trial.XLS]PSUML5'!F15

What do I do if I just want the function to appear as :
= PSUML5F15
on the new sheet ?