There are two sheets. On first sheet you are entering data, when goods are received from supplier/vendor and you need to prepare calculation for each product separately. After you enter data just press Calculate and calculation is made automatically. It is done in Visual Basic for Application and your system need to support macros.
This is made for local customer and follows some standards and legislative regulations in Montenegro.
Of course it is possible to make it for any other country and please order Custom or Detailed package for all other countries.
Please do not order before we agree on all conditions and I have fully understand your requirements.
It is tested in all Windows and versions of Excel above 2003. Not tested yet on OS X and Linux