If or where statement

[KayCarlson via AccessMonster.com]

I am trying to get a field to populate in a continuous form. Where
SpecificationID is either 1leaner or 2hanger I need that number to auto
populate in column named either leaner or hanger. Is this something you can
build a query to do within the field properties in a form?

Help to new user appreciated!

Thanks,

KCarlson