Hello & Welcome to the Board,
Well my two cents. You are making this a little tougher than it should be.
I would keep all of my data on one master sheet and if you want to look at a specific PO, then filter.
If you want to make quick calculations on certain items then look into a pivot table.
The creating of all these extra sheets makes up keep that much harder.
Another option is to create your individual sheets and then use some code on the main sheet which when entered on the main sheet will automatically transfer to the individual sheets.
Here is an example
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