I'm not quite sure I understand what you mean by "merge the session layer to the route" - that is very much what I want to do, but I can't figure out how to do it.
Ok! To move the session layer onto the route layer
1) Load up Edit Session
Note: If you are using TRS22 PE or have a Trainz Plus subscription and Surveyor 2.0 is enabled, I would strongly suggest using Surveyor Classic.
To change from Surveyor 2.0 to Surveyor Classic, click on the 'Wrench/Screwdriver' icon at the top to open the tools menu, then choose 'Edit in Surveyor Classic'.
2) On the right, you will see a few tool menus, hover your mouse over these and find the one that will read 'Layers'
hint: The icon looks like a stack of steel sheets. Open this menu!
3) Click on the 'Session-layer' then hover your mouse of where you see these icons '+, X, something that looks like 3 railway sidings going into a single line, and a padlock'. When you read 'Merge Layer' click on this icon.. Hint it's the one that looks like 3 railway sidings
4) Then a pop up dialog box will appear, asking you to choose which layer you want to merge the session layer to. Choose the appropriate 'route-layer'.
Note: If your route is generated by TransDEM you will have more than one layer. You only need to merge Session-Layer to 'Route-Layer'.
Warning: If the padlock in in the closed position, merging the layers will be impossible. Make sure that the padlock is in the 'opened' position.
Quick key hints: Press F6, note if you have an FN key on your keyboard. Press FN+F6 to open the layers tool menu.
Click on the session-layer, then press 'M' then choose, route-layer when prompt..
Allow the process to complete, then you can start saving your route and session
