Join our CAD community forums where over 25,000 users interact to solve day to day problems and share ideas. We encourage you to visit, invite you to participate and look forward to your input and opinions. Acrobat 3D, AutoCAD, Catia, Inventor, IronCAD, Creo, Pro/ENGINEER, Solid Edge, SolidWorks, and others.
Use DDEDIT to edit the text in arc length dimensions or you can also use Properties - select the dim > Rt. click > Properties or double-click the dim - to change text overrides, alt units, prefix/suffix, etc. just like all other dimensions.