Since your profile indicate that you use excel 2010, while your file is .xls.
I've save to .xlsx version for use AGGREGATE function.
And use INDIRECT to avoid refer 'All column' in formulas.
I4
I5
I7 count for case Minimum stock < Avilable Stock
Press Ctrl-Shift-Enter
I8 count for Avilable stock is not presented in CORE
Press Ctrl-Shift-Enter
(For I7 & I8 , was try to use only formula that support in .xls , but fail so you can see IF() instead of IFERROR() in the following formula >_<" )
A2 for list part that require to reorder (Avial < Minimum)
B2 Qty for re-order
And you didn't provide 4th sheet so I've create a 4th_list here.
E2
Regards.
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