Hi all,
I have a dataset that I'm trying to blend to combine rows based on a certain criteria that I've identified. The following screenshot shows what my data looks like:

Basically, if two rows have the same KEY then the rows need to be "combined" by putting the SKU Numbers in the same record. For example, lines 3 and 4 having matching SKU Numbers. To combine them, row four would be deleted and the SKU Number on row three would read like "91100, 91200" to reflect the combination.
Below is a screenshot of the desired result:

Seems like an easy task but having trouble wrapping my head around it so any assistance would be appreciated it.
Thanks!