Using formulas as flags (?) CR 2011

Hi,

Excuse me if this is a newbie; its an area I've never used before.

Can I create a formula that I can do a binary test on?

If I create (pseudocode) formula @PF_Glass as:

(tbl.partnumber >= 100016  and tbl.partnumber <=1000018)  or  tbl.partnumber =  1000020  or  tbl.partnumber =  1155020

or (tbl.partnumber >= 1900000 and tbl.partnumber <= 1975125)  or  tbl.partnumber =  1976125

or (tbl.partnumber >= 1977320 and tbl.partnumber <= 1999050)  or  (tbl.partnumber >= 4904030 and partnumber <= 4999025)

or (tbl.partnumber >= 6915020 and tbl.partnumber <= 6980020)

Can I then create @Specialty?:

tbl.productgroup like 20% and not @PF_Glass

Do I need to show any kind of precedence?

Also, can I then test these to set a commission rate?:

global numbervar CommRate;

if Salesperson = 'Bob' and @PF_Glass then  CommRate := .03

else if Salesperson = 'Bob' and @Specialty then  CommRate := .025

else  CommRate := 0