Copy tracks to include the routing on both ends. ie. Also copy the bus track that the tracks you wanted route to.
Maybe you already had a VOCAL bus track and it simply routes to your MIX bus track. Paste only the imported vocal tracks... PITA having to add the routing for them! Paste the imported tracks that includes the bus track with them routed to it. Now just route the 'new' vocal bus track to the mix bus and delete the old one.
Just one example. The secret is to include both ends of routing you wish to preserve.
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