Programing POS function keys

I would like to program an Alt key to allow cashiers to access layaways without haivng to go in through the F11:Recall key (for security reasons). I tried to do this by programing a macro (pushing Ctrl F3) but to recall a layaway and program the key I would have to recall a specific layaway (not just stop at the layaway screen). Is there another way to program these keys? Thanks for any suggestions, Margie