Hello All,
Would someone be prepared to teach me how to do what I need in my question
below?

If possible (willing) please help.

I am trying to copy data from one file into another.
I have copied code from various sites and tried to manipulate that code to
do what I want it to do.
No success, as I am a novice code writing understanding what is happening
and how to change it is the problem.

I need your help if possible please.

Here is what I would like to happen.
The base or main file is called RMA.xls.
The other file which is e-mailed to me is called RMA LMR.xls.
Columns A to K have the same headings in the two files.
In the RMA.xls file Columns L to P are different to RMA LMR.xls and unique.
RMA LMR.xls has Columns L to M that are different and unique to this file.

Column B has the list of unique ID for both files.
What must happen is as follows:
1: RMA.xls. is open and RMA LMR.xls must be found and selected to be opened.
2: Compare the two ID keys to see that they correspond. RMA LMR.xls to
RMA.xls. (RMA.xls.is the base).
3: Copy the data in Column L and M from RMA LMR.xls. to RMA.xls, ensuring
that the relevant Ids match exactly.
4: Close RMA LMR.xls.
5: Save RMA.xls.

If you are able please help.

Thank you and best regards

Max