Change of formatting in a sentence to subscript

I am creating a l;etter generator for a redress calculation in word rather than excel. The below piece of code is part of the breakdown table and I want the (1) in the "Selection.TypeText Text:="Interest(1) on (A) to date" to be in subscript (as it refers to legal wording at the bottom of the document) but the formatting keeps it Arial 11 and I cannot work out how to change it.

Not sure it's the right forum but it's the only place I am joined up so thought I would throw it out there. I have tried find and replace but it didn't quite work

Any assistance would be appreciated

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