Use Point MultiWave Line 
to place points to form a line that shapes the wave patterns in a MultiWave Fill.
Shortcuts
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Point Create Tab, Enhance:
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Keys: Alt, P, W; Alt, Q, W, P
Create a Point MultiWave Line
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Select a MultiWave Fill area.
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Click the Point Create tab.
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Click the Point MultiWave Line
icon. -
Click to place your first point. The point appears automatically as a small hollow circle.
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Click to place a second point.
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Continue placing points along the desired path.
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Curved lines are created automatically. For corners and straight sections, hold down the Shift key.
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Right-click to end the line. The MultiWave line will appear on the fill, and the wave patterns in the fill will follow this line.
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Repeat to place as many MultiWave lines as desired.
To follow a background picture, select 2D View 
in the View tab, and zoom in as necessary.
You can move points after the line has been created. To add or remove points, use Insert Points 
or Delete Points 
in the Home tab.
Use Delete MultiWave Line 
in the Edit tab to remove a MultiWave line. See Delete MultiWave Line.