If you open an old album file that was using a different tax setup then, in order to ensure that the tax amounts for any orders in that album don't change, ProSelect will add back the tax setup used in that album into your list of available taxes (in the Tax Setup window).

ProSelect warns you if this is happening when you open such an album file.

If you see this warning message, then it is best to check if the newly added tax is still required needed. If not, change the Order Group's tax setup to another tax (at the bottom of the Order Group Setup window), then delete the extra tax item in the Tax Setup window and save the album again.

 More information on "Handling Tax" and Order Groups can be found in the ProSelect Reference Manual (quick access under the Help menu in ProSelect).