On tab A
number amount
123 10000
123 20000
456 30000
789 15000
789 10000

On tab B
number amount phase
123 10000 1
123 20000 2
123 45000 3
456 30000 1
789 15000 1
789 650000 2
789 10000 3

How can I attach the phase number to the correct element on tab A (ie that
the amount and the number match)? Tab A has 13000 lines, Tab B has 44000
lines

I thought about concatenating the number and amount fields together and
doing a lookup based on that, does anyone have a better solution?