Interlinking and updating values in two different sheets

Good Morning peeps!!
Here is a new challenge.

Today morning I was working on Test sheet. Challenge is like this.
"Order-Customer data" and "Buying In Sheet" sheet have status column. Now status column would have same options (From DROP DOWN) in both sheets. I want to interlink the both in such a way that If I change the status from any sheet the changed status will reflect on the other sheet in status column.

PFA file TEST file.