Partially removing both top B-pillar trim panels

NOTE: Description is for left component only. Procedure on the right side is identical.

Partially remove B-pillar panel upper section

Unclip clips (4).
Feed the B-pillar trim (1) from the guides (2) at the top.
Feed the B-pillar trim at the top (1) with the B-pillar trim center (3) out of the edge protection lips at the front and at the back.
B-pillar trim top (1) and B-pillar trim center (3) remain in the vehicle.

Courtesy of BMW OF NORTH AMERICA, INC.