If you name them with a common name you can create an asset report based on scan name.
Let's say you have 10 scans..
Name scan one "myscan-1", scan two "my scan-2", and so on, replacing "my scan" with whatever you want to call it.
Then you can create an asset report using condition contains "my scan"
This wil combine all scans into one report. The only way i can think of to cross reference the scan names with the hosts involved in excel and do a vlookup as an addtional column in the csv to return the scan name from the scan name-host list you previously created.