I can't update apps with new Apple ID I used to have an old Apple ID, and I have a specific paid app I purchased with that ID. I now have a new Apple ID, and I wanted to update the paid app from the old Apple ID with the new Apple ID. 

I am wondering if I deleted the app, would it show up as "purchased" on my new Apple ID?
No - purchases are not transferable, but you could set up your new account as family share and if the purchases are eligible for sharing, you would then get to use the new appleID and password to download for free the "purchase" from the 'family member"