Lookup + Single Select Formula

[Contact_W_Manag]

I would like to do a lookup based on what is selected in a Single Select field.

For example:
IF single select field is A, Lookup Record X
IF single select field is B, Lookup Record Y

How can this be set up to avoid errors?

[ScottWorld]

Lookups are based on Linked Record fields. So you would need to choose either Record X or Record Y in your linked record field.