If you will not use the classes of varSubNavFrame and varMainContentFrame then you could map their classes to ignore.
However Tony's method would be safer in case you need those classes later.
Or another method you could use is by declaring the varName window as follows:
</font><blockquote><font size="1" face="Verdana, Arial, Helvetica">code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">
window MainWin CreateNewTC
tag"whatever tag is recorded"
//(HtmlField is whatever class it is of
tag"[Class of varSubNavFrame]tag
of varSubNavFrame/[Class of
varMainContentFrame/tag of varName"</pre><hr /></blockquote><font size="2" face="Verdana, Arial, Helvetica">Now you can use CreateNewTC.varName