Pivot table grouping, adding description to cells

HI,


I LIKE TO KNOW IF I CAN ADD WORDING TO AN EXISTING CELL AFTER I'TS ALREADY BEEN FILTERED. OR MAYBE ADD AN ADDITIONAL CELL TO MATCH ALREADY ANOTHER CELL.

PLEASE TAKE A LOOK AT PIVOT TABLE YOU WILL SEE A SERIES OF NUMBER LIKE " 2PNC01234G4P9LH" this is a serial number and I will like it to say somewhere that it is a serial number. also, "314899" is the RMA number, but i would like for it to say RMA somewhere. so basically i would like for the viewer to know what each number or description means.