Append Another Form to My Current Form

Greetings!

Say I have Form XYZ.  I am wondering if it is possible to attach a separate form (say, one stored on my company's website) to the end of Form XYZ if a user makes a certain selection within Form XYZ.  I am trying to limit the amount of places our users have to go when they have to fill out extra forms based on their selections within Form XYZ. 

Any help would be greatly appreciated.

Thanks!