Copying Metrics/Side-bearings not working

I was working on non-Latin in a separate file and now have to combine the two, but the sidebearings aren’t copying over so everything is shifting the wrong way. I’ve tried copying All Data and then just the metrics alone but either are working.

also my smart component layers aren’t coming over as well. I am adding the non-Latin via that master panel first by ‘Adding another font’

Just copy and paste all the glyphs from one font view to the other.

The function for adding another font in the font info window will create a new master. I don’t think that is what you want.