font substitution for cells

My organization is planning to change the default font for their standard text, but has many pre-existing cell libraries with the previously used font (a customized .rsc file). Unless there's a way to go through all the cells and change the font for all text, we don't want to have to search for and change the font for all these cells. Can anyone tell me what I have to do to force the substitution of the Arial true type font whenever cells are placed that have the font from our previous .rsc file? We don't plan to use the .rsc font anymore, so it won't show up in a font library folder anymore either.

 

Thanks for any assistance,

Stephanie