add Folder into TEMPLATE.fmb

Hi :

Request to build a new form to query data  from table out from oracle EBS 11.5.10.2.  So I use template.fmb to build the form.  it is not that hard.  however, it also require to allow user to add new field that existed from the table but not currently show in the form.   I think I need to "enable' or "add" the Folder > show feature in the template.fmb.  I search Metalink and google around, did not find good information.  I found few expert developer post step by step but without understand it, I run into a lot of issue.