Not sure I read your code right but it seems to me that the code loops through every sheet in your "Master" file and saves each sheet as a separete file with sheet name as fil name.
If this is so perhaps you could just loop through your master file, checking sheet name and delet the one do not wish to keep and transfer formulas to values for the other sheets. Then you save this modified file with a new name and as an xlsx file to get rid of the macro as well. This way you will still keep your original "Master" file intact.
Macro something like this perhaps:
Alf
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