Define a calculation field:
If ( field x = "TX" ; Terms a field ; Terms b field )
Place that field on your layout and you have it.
You can either place the literal text in quotes in the above function of the name or text fields that store the different terms.
Of course! thanks. I was not thinking about "field" manipulation because I had initially put a stable text-box paragraph in the layout. But formatting "invisibility" in the field by margin, etc., accompishes the purpose and gives me options for several "cases" of text message. Thanks.