Quick question about loot tables

Firstly, I am pretty new to modding unreal engine, so apologies for my noob questions.

I want to remove certain items from loot tables, so I included copies in my mod of loot item sets such as LootItemSet_GenericFishing, LootItemSet_SupplyDrop_Level45 etc, removing the items I did not want from the loot sets.

However, I am a bit unclear on how to link up these included loot sets so that they take effect when I cook the mod. There doesn’t seem to be anything in my PrimalGameData BP to do this.

What other steps do I need to do to make this work? I’ve looked around for any youtube tutorials or other info on editing loot sets and drawn a blank so far, but it could just be that I don’t know where to look.

Many thanks in advance.