Maybe you need to show some of your existing code.
This doesn't even "feel" like an ASP question to me, since obviously you could simply do
<input type=hidden name="NA" value="<%=RS("NA")%>" >
in HTML code.
Are you auto-generating the form, using the DB field names??? If so, you could simply do
Set RS = conn.Execute("SELECT * FROM table WHERE someid = " & someid )
For fnum = 0 To RS.Fields.Count-1
Set fld = RS.Fields(fnum)
If UCase(fld.Name) = "NA" Then
<input type=hidden name="NA" value="<%=fld.Value%>" >
<%=fld.Name%>: <input name="<%=fld.Name%>" value="<%=fld.Value%>" >
But, really, maybe you need to show code????