Migrate BOP project to regular project. Project boards work the same, regular projects have some cool features. In knowledgebase repo you can't create a classic project, so seems GitHub wants projects to be migrated.
Transfer issues from BOP to Knoweledgebase through UI one a time. It could also be done in bulk programatically from the terminal, but UI is probably faster.
FYI
I do not have full privileges on issues in BOP. For instance, I cannot add labels or edit comments. This won't matter unless there is some reason to keep BOP.
Projects can refer to multiple repos (I think this is relatively new).
Proposal:
FYI