How do I merge two bathymetric profiles into one profile?

In many cases bathymetric profiles will not be long enough and in this case it it useful to merge two profiles into one.
Below is a short explanation and a detailed explanation on how to merge profiles.

Example of two crossing profiles

Short version:

1. Put the two profiles in an empty folder and run the command Append all lines in a folder.
2. Run the command Red Snapper on the merged dataset to digitize a new profile.
   

In detail:

1. Make sure the profiles you want to merge are the only two profiles in your folder.
2. Select the folder and in the Toolbox under Shared Commands > Editing run the command Append all lines in a folder.
    
3. Click OK on the message that appears.
4. Right click the folder and select New > Workspace Data > appendedData.
5. Right click the appendedData and select Utilities > Red Snapper.
6. In the menu click Display selected data with green points and check the box Enable hotkeys c m s.
7. Click Start snapping.
8. In the graphics window click on the first point on your profile (it should automatically snap to the point).
9. Zoom in and place your cursor close to the point before the crossing line and press m on your keyboard (this will select all points along the line up to that point).
    
10. Click on the first point on the other line in the direction you want to go. 
     
11. Zoom to the end of the line, place your cursor on the last point and press m on your keyboard. (this will select all points along the line up to that point) 
12. In the menu click End snapping
13. Click OK on the message that appears
14. Right click the new dataset appendedData_redsnapped and select Rename (give it a useful name)
15. Right click it again and select Set Schema > Bathymetric Profile
16. Right click it again and select Properties > Geodetics
17. Click Set geodetic meta data
18. Give it the same geodetic settings as the original profiles had.
19. Click Close

You two profiles are now merged and ready to be analyzed.