Removing characters from different cells based on contents in a separate cell

Hello all, hope someone can help with this.

How can I remove the characters (initials) "BD, NK, PS" that appear in the light blue cell at the bottom from where they are in the white cells above. The order in which they may appear in the light blue cell can be random and the initials can vary at different times but will always match initials somewhere in the white cells above. The positions of the initials in the white cells is always fixed.

I have tried to nest a few search and replace functions but have had no luck.

Any ideas? Thank you