this is very easy to do....
On the side bar (left hand side), where you see the different VTS and VGMs, this is where you add new movies and menus. Near the top about right after where it says VGM menu (I think that is what is says< I am at work so I can look at it and give full details)
Click on the button that says connections. Once that opens up you will see a new screen on the right. On that screen right click and click on "draw connections" from there click on the button that says first play (In the same screen) and draw a connectiopn to the video you want to play first. After that draw a connection to the menu you want to play after that video. Very easy. When I get home from work I will try to go into detail if you are still haveing problems