BHasman is correct. You need to have a look at the Property Data Formats of the Property Set Definitions that your Schedule Table is using. There you can set the units to show only inches. As for the "TO" and the "Ø" symbol, those will have to be part of the formula, including "if statememts" to determin the shape of the part, if it is transitioning or not, and many others to deal with offsets, elbows, and other fittings.
For scheduling Duct and Duct Fittings, we use the Part Size Name instead of Formula Properties to schedule sizes. The Part Size Name is also a formula built into the fitting, but you have the advantage of creating formulas on a fitting by fitting basis rather then trying to create one huge formula that will embrace all fittings and their unique properties.
Steven Micaletti
Virtual Mechanical
Design Build Software & Content For AutoCAD MEP