Merge Groups
We explain how to use [Merge Groups] to draw the outlines of multiple objects as though it was the outline (silhouette) of a single object.
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Create a scene using Pencil+ 4 Lines. 
 In this example, we create 4 standard [Polygon Cubes] to which we apply Pencil+ 4 Line. To make the effect of using [Merge Groups] easy to see, we applied [Specific Brush Settings] to the Outline to change the color and thickness of the lines.  
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Create a group. 
 We select the 4 objects and press Ctrl+G to group them together. 
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Open the [Pencil+ 4 Line] window. 
 From the file menu, we select [Pencil+ 4] / [Open Line Window]. 
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Add the group to the Merge Groups list. 
 We click [Add] in the [Merge Groups] tab of the Pencil+ 4 Line window to open the window [Add Groups].
 We select group1 in the list and click [OK].Groups and sets to which objects were added can be used in the [Merge Groups] list. 
 If stratified groups are added, the top-most group will have priority.  
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Activate [Merge Groups]. 
 We check [Merge Groups] in the Pencil Line Set node. 
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Render. 
 We click the button [Render the current frame] above the viewport. The outlines of the 4 objects are rendered as the outline of a single object.