Heres what i have... i have a spreadsheet with two columns. One colum is DEVICE LOOP, the other is DEVICE ID.
I need to take the device loop value and join/append it with the value in the next column.. and put a dash between them.

Example
DEVICE LOOP | DEVICE ID
1 | 205


I need it to make it....
1-205
and put that into a new field in a new column...

I am new at this.. and my terminology may not be right. English is not my primary language.