Use Insert Points 
to add a new point to the currently selected line.
Points may be inserted into all line and area types except Single Stitch. With this object type Insert Points and Delete Points are not available. For columns, a pair of points will be added.
Points may also be inserted into emboss lines and MultiWave lines.
Click the Insert Points icon 
, then click the position on the selected object where you want to add the point. Also use Insert Points
to add stitch angle lines to satin areas with click and drag.
Shortcuts
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Home Tab, Points:
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Keys: Ctrl + Shift + D; Alt, H, IP
Insert a Point in a Line
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Click the desired object to show the points that make it up.
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Click the Home tab.
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Click the Insert Points icon
, then click the place on the outline of the object where you want to add the new point.
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To add a stitch angle line to a satin area, click and drag to draw a line across the desired section of the area. If the angle line does not appear, then it is not allowed in the place you attempted to draw it.
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Right-click to deselect Insert Points.
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Click and drag to move any of the points in the object to alter its shape.
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If desired, click the Insert Points icon
again and repeat.
The Insert Points icon is only available for objects that can have points inserted.
A stitch angle line cannot cross another stitch angle line. New lines must be added roughly parallel to the existing lines.