Custom Client Fields not showing in order forms

[mark-in-dallas]

I'm new to WHMCS,  and while most everything was easy to figure out and setup, this has me stumped.  I can create custom fields in Products/Services and make them show in Product Order forms, but I am not able to make custom client fields show on the order forms,  no matter what I try and regardless of the fields being set to Show on Order Form and/or as Required Fields    They do show up fine on the  Client Profile pages, just not on the order forms, and I can't for the live of me figure out why.  Any help would be greatly appreciated.