Create a conditional expression for each type

[RBNicho]

Hello,
I have created a pipeline c/l with many fields, one of which is the
product name in the pipe...I have created a new field called
product_id and want to be able to assign an ID no. for the products.
categories are:
Crude = 1
Refined Products = 2
Chemicals/LPG/NGL =3
Idle = 4
so if gasoline then would be 2, if benzene would be 3, etc...
tried
if [field1] = gasoline then [field2] = 2 end if
keep getting an error "user interrupted" does it matter what type of
field it is?

Thanks,