Research 'All' excluding what exists in selected Stack(s)

[cweber]

I would like to search all my resources on a theme (e.g. Music) and add to an existing stack that I previously created from the same search a few weeks ago. However, I would like to omit those resources already searched, as identified in a nominated Stack(s), so I only search newly added resources since the last search.

 

Perhaps it is possible to save such searches. I am wishing to avoid reading through all the same references all over again after adding new libraries.