How to Print Dunning Clerks email & Fax No. on Dunning letter

Hi Experts,

I have requirement about Dunning letter. Client is already using a dunning letter with specific format. Now he wants to Add Dunning Clerk email & Id & Fax number on the available format. I am unable to find specific Table for both(Dunning Clerk email ID & FAX Number) from which I can fetch the value & print on the form. We are using Cusomize form for this.

Appriciated your quick response.

Thanks