how to format column D to Paste a value based on Column A

I am new to excel, but my small business vendors have gone to updated spreadsheets and have left of some of the usual fields off the datasheet


so here is my question. I need to know how to make excel look at a value in column A and based on what is there place the correct words in column D

example…,

the warehouse sku = CNVEF-IGFFDVD228

well the 2 or 3 letters after "-I" = different vendors

Example #1 (3 letters after "-I")
I need a way for excel to say if "GFF" is after "-I" then place ___ vendor name in column D

example #2 (two letters after "-I")
warehouse sku = CNVEF-IDSDVD1362
I need a way for excel to say if "DS" is after "-I" then place ___ vendor name in column D


I think its macros, but im not sure (if i posted in the wrong threat let me know)

there are about 40 different vendors and 70,000 products that need to be like this., so the easiest way to do this would be helpful