I am trying to insert a SalesLogix field into an existing template, but when I open the Insert SalesLogix Mail Merge Field window, the field I want to insert is not available.  What I do not understand is that the field I am trying to insert is already an existing field in the template.  If the field could be insert by the original template creator, why is the field not available to insert a second time?  I feel like I am overlooking a basic element here, but clearly I am not sure what that would be.

*Edit*

Asked that question prematurely, I did not realize that one can right-click on a field in the Insert SalesLogix Mail Merge window and then select CreateLocalJoin from the context menu where one can proceed to join to another SLX table on that field.