Index Match problem

Will you please attach a sample Excel workbook?

1. Make sure that your sample data are REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired solution is also shown (mock up the results manually).

3. Make sure that all confidential data is removed or replaced with dummy data first (e.g. names, addresses, E-mails, etc.).

4. Try to avoid using merged cells as they cause lots of problems.

Unfortunately the attachment icon doesn't work at the moment, so to attach an Excel file you have to do the following: just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.

Please pay particular attention to point 2 (above): without an idea of your intended outcomes, it is often very difficult to offer appropriate advice.

Try array entering the same formula.

If you aren’t familiar with array-entered formulas array enter means the formula must be committed from edit mode by simultaneously pressing and holding down Ctrl and Shift while hitting Enter.

Im not sure you can use LEFT to define the MATCH range?
=INDEX('Database - Product.xlsx'!Table1[New Link Code],MATCH(LEFT([Prescribed Item],15),(LEFT('Database - Product.xlsx'!Table1[Product],15)),0))

As a test, try creating a helper column to pull out the LEFT-15 from Product, then run the MATCH based on that helper?