Changing Numeric Value

[jminnie]

Please forgive me, but I still don't understand. I extensively researched all suggestions and just get confused. Can somebody just post a full example. I'm sure I can make that do exactly what I want to do.
Example: copy 555 to a variable or clipboard. Subtract 1 from it. Then paste the end result (554) into another program.
Any and all help would be much appreciated.
Thanks