Ok, I see what you are trying to do. You cannot place money into the TL button unless you have subtotalled a sale first (calculating change).
You can have your PLU buttons as open price. This will allow you to type a price and then press a PLU so that the PLU can have a different price every time you use it. It depends how the PLU has been setup. Also, you must never use a decimal point when typing prices.
If you turn to REG mode and type 100 then press a PLU button, it should ring up $1.00 into that PLU. If you get an error, then the PLU has been set for a preset price only (I can give you the codes to change it to open and preset).
If this sounds like what you want to do, just let me know.
Mark, December 2008