I'm having difficulties with using Power Query M-function.
The problems I'm having with is to make cells blank previously contains 'US Core shipping' on column 'promotion-ids'.
For example, there are 'US Core shipping A3JU1250912' 'US Core shipping A3JT982918'...
These words are all different but they have 'US Core shipping' in common.
So I want to make these words containing US Core shipping~ to blank.
Please help me solving this problem.
Attached below are advanced editor and current m-code on my columns.