The 'Copy' feature within Assets has now been upgraded to allow for you to select exactly which data you wish to copy over to existing Assets already in your account.
Firstly, click into an Asset and click 'Copy'. From there, make your selection of which fields you wish to copy over to the existing Asset(s) - all fields are ticked by default. Once done, click Continue.
In the 2nd window, select 'Existing Assets' under 'Action' and then use the search filters below to search and select the relevant Assets you wish to copy the data to.
Once done, click 'Copy Asset' and this will then copy the data to the selected Assets and then take you to the Assets list page with just these Assets showing. You can then click into an Asset, edit and then click 'Previous Asset' and 'Next Asset' to quickly review/edit your new Assets with unique data like ISRC/upload Audio files.
You are also able to use 'Match - Match Audio' from the Assets list page to bulk match Audio.
You can also copy Asset data to new Assets, full guide on this linked here!