Dynamics AX has a basic travel approval feature that can be used in con-junction with the expense module. This is really a request approval feature to pre-approve a travel request. This doesn’t do any sort of travel booking, management etc. The video below gives you a walk through of the travel request.
This walk through above was done on AX2012 R2. You can use the demo VM on any AX2012 release to go through this. This video below is some setup that you might want to configure some of the features.