I am trying to create the following formula:

I have two colums (A and B) with numbers.
Formula 1 checks if A=5250.001 and B<=5000 then returns CIR2
Formula 2 checks if A<=5000 then returns CIR1
Formula 3 checks if A=5250.001 and B=5000.001 then returns OOC

I can get all three formula working individually but I need them to work
together as one formula, checking all three "ifs" and returning one of the
three results.

Can anyone help me with linking the three together or advise me if there is
a better way to calculate this?

Many thanks,

Cheryl