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I'd submitted this awhile back for this same reason, Nick. 

https://www.tradingcarddb.com/FeatureTracker.cfm?MODE=VIEW&ID=137&PageIndex=1

Just to add, if you have a card in one collection but also want it for another collection (in my case, I have a PC collection and a set collection), if you add all missing cards in a set to your Want List, it will not add cards that are in your other collection.

For example, let's say I have the 1968 Ryan RC in my PC but I want all of the missing cards of the 1968 Topps set in my Topps set colelction, if I us the Add all missing cards to my Want List, it will skip over the Ryan RC because it sees it in my "Total" Collection.

You can do itone set at a time.  When on the page to update your collection (Main Collection) , click on the window "Choose an action". in the drop down menu you should be able to move everything to another collection.  This will move Wants, Traders and cards in your collection.  If you only want to move the Cards, the traders, or the wants, select what you want displayed from the upper window showing "All Cards".  I did this for all the sets I had (too many to count).  I have a collection just for Traders so I first moved those, then moved the cards in my collectiona dn the wants into the proper collection (by company name).  This was the fastest way I found to do it.

I only discovered the best way to do this because of the extensive amount of sets I had to deal with. I did not want my sets collections to have my traders in it as it extends the checklist too long and you have to guess on what page the card you wish to addis if it is in the higher numbers.  That is why I have a traders collection.

Initially I was deleting all of my traders and then manually adding them back into the Traders.  Then I figured this out.  I went through the rest of my sets in quick order.