Shifting media level metadata at item level

I’ll try to explain as best as I can. We are building an architectural archive in which we have a database of architectural drawings of different building project. So currently we are placing the metadata of a building project at item level and the metadata for each architectural drawing within that project at the media level (let’s say ‘H1’). However, we were exploring the possibility of shifting this hierarchy and moving the building projects at the item level and shifting the subsequent architectural drawings at the item level (‘H2’). We have already uploaded some data in the H1 format so if we want to convert that into the H2 format, is there any way or setting or module that allows us to shift or export metadata from media to item and/or item to item set levels? Hope it makes sense and any input will be very helpful. Thanks.