Yes you have two options that I can think of:-

1) If you click File>New you will see a standard atmel/visual studio dialog open. You can extend the sections within this window and add your own templates. This article demonstrates how to add a new project with a single empty .ino. You can copy it and add as many .ino files as you need containing Arduino code. 

The example shows how to create a new empty Arduino sketch from a simple template that contains the setup() and loop() methods


and you can group your project templates simply by putting the templates files in a sub folder such as "My Arduino Templates" (maybe a name that not so verbose)



2) Another option is to make use of the VisualAssistX extension that is installed with Atmel Studio. Take a look at the VAssistX menu it contains a menu item called "Insert VA snippet". Also take a look at VAssistX>Tools where you can add your own snippets.

I hope this helps