Failure to create a subscript preset

I am trying to create a preset for subscripting. In my manuscript, I have succeeded in entering text that has a subscript (using the CTR-G, CTR-down arrow). It looks fine.

But when I select my subscripted text and go to formatting and create a new preset, the preset is created but it does not work. That is, the new preset has no effect on a new selection of text.

BTW, I am not trying to subscript numbers but rather text. Could that be a problem?

Mike

It now is converting text to a subscript format. But it is not working properly. After selecting a segment of text, it subscripts the entire paragraph in which the segment exists rather than just the selected text.

Also, I have not found a method for converting a subscripted segment of text back to regular default text.