Yes, sorry about that. You need to set TemplateSwitching.Enabled to true.
This is how I did mine and it worked out great.
Just make a copy of your template.master and call it producttemplate.master
Then remove that left nav that you do not want from the producttemplate.master
So basically, you will have everything the same between template.master and producttemplate.master except for that producttemplate.master will have the code to display the left nav you don't want removed.
For example:
If you don't want the categories left nav in producttemplate.master then delete the following lines:
Code:
<aspdnsf:EntityControl ID="ctrlEntityCategory" runat="server" Header="<%$ Tokens:StringResource, AppConfig.CategoryPromptPlural %>"
EntityType="Category" MaxMenuSize="<%$ Tokens:AppConfigUSInt, MaxMenuSize %>" />