If you have a two column sheet in excel and column A is your Function and B is the hex or ascii string, you highlight all commands and copy. Then in the RS232 library manager, select edit at top and paste. It will only do it if you copy both the function and string columns.

You do not have to "add string" to paste. The editor automatically creates new ones to paste into. This helps so if you already have 10 commands and add they won't be erased.