May times I'll have a list of donors externally and would like to do something to just that group. I create a query and tell it that I want the constituent ID to be one of. Then I manually enter the id. Then I am able to work with that group. If RE made it where you could copy and paste into that field I think that people would find it very helpful.
If you are doing a constituent query, ID one of, you can paste up to 500 ID's into the query. Many posts on forums and it's in knowledgebase. Here's the link: https://kb.blackbaud.com/articles/Article/41666