Creating List with Lookups based on metadata

Question

Good morning,
I have a large library with thousands of files that all have an Activity_Number & Doc_Classification.  Each Activity_Number should have multiple files with Doc_Classification's "1","2" & "3" etc.
For audit reasons, I'm trying to create a list where I can paste Activity_Numbers into a column and bring back a lookup from the library with columns for each Doc_Classification 1, 2, 3 with a Yes it exists or No it doesn't.
Is this possible out of the box? I've managed to do a lookup for that Activity_Number and it pulls just a random Doc_Classification, but how can I get it to grab all of them?
Please help!
Thank you!

Answer 1

Yes its possible OOB but require little effort to update Activity_Number for all records. Follow below steps:
Create lookup column for Activity_Number in your document library
Now go to view all items of  document library, click on library tab and then select Quick Edit (Excel view)
Select Activity_Number(old) and copy fields, and paste them in the Activity_Number lookup column.
Once you complete it, you can match the fields as now both fields will be showing same value (old and new)
Now you can delete the old field.
Adnan Amin MCT, SharePoint Architect | If you find this post useful kindly please mark it as an answer.