Can you provide more details regarding your scenario, specifically about how the fields may be related to each other? It looks like the "Pay Hours Calculated" field is in a table, but I'm not sure of the "Annual Pay Hours" field.

Here's an example using a table with three columns. The first column takes user input, performs a lookup and returns a value in the second column, and then based on that returned lookup value, the third column will use either 1 or 2. See below for the setup.

And here's a video demonstration.