This is a piece of advice I got from a kind structural engineer previously.

According to building by law and Street Drainage & Building Act, any alteration to building structure needs to be approved by majlis. So meaning you will need to submit drawing to change the layout of the wall to MBSJ and obtain their approval. Maybe can try asking the PIC at MBSJ to not issue permit, but you submit drawing and they approve the drawing for alteration to the wall structure.

My advice to you is to appoint a structural engineer to help with the drawings and submit them to MBSJ, but it will of course cost a few thousand ringgit according to the scale of alteration.

Management don't want to take the responsibility if there are any issues after your hacking of wall that is why they wants the majlis to provide approval, if anything they can push the blame to majlis instead.