Choosing Routes for Split Lines
Wherever possible, route the split lines through gaps in the embroidery, to minimize the cutting up of stitch areas.
When splitting through a stitch area, try to take the shortest route through the area if there is an obvious way to do this.
The split through an area of stitching can be concealed by positioning the split line next to natural edges within the design. When crossing an open area of fill or satin, split in line with stitching.
When following a line of running stitch or satin border, if possible, place the split line to one side of the line or border so that it is not split into multiple segments. Check this by clicking OK to go back to the main screen, and in the View tab select 2D View with Stitch Points 
to see the stitch points, and check the exact position of the split line. When you must cross the line, place the split line fully across it so that it is split cleanly.
If it is possible to route split lines through gaps, with only a few or no cuts across stitch areas, use the Trim option for Connection in Split Options. Use the Running Stitch option for Connection when the split lines cross large stitch areas.
The final size of each split section must also be assessed. Try to avoid having any sections that use the full width or height of a hoop if you have split through any stitch areas. This would mean that you have to be very precise when hooping up such a section. If you must have a section that uses the full height or width of a hoop, then this section should be stitched first.
Use the zoom functions to zoom in and out to help with precise adjustment of the split lines. Click OK to go back to the main screen, and switch between 2D and 3D view to check that split lines are placed correctly. Add and remove points on the split lines as needed with Insert Point 
and Delete Point 
.