Creating new UNISTRUT configurations?

My company uses a 5/8" UNISTRUT. This size is not in thebasic toolbox installation. Does anyone know how I can creat a newconfiguration for this size so that I can it in my assembly's?

I did find a configure... option under the Toolbox pull down menubut am unsure of how to use this feature. Is this where I go tocreate new sizes for UNISTRUT? If someone knows of a tutorial onhow to use it please let me know.

Thank you.SolidworksToolbox