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For this option, we can remove nodes inside or outside of a polygon. The polygon can be loaded from an external file or instant drawing.instantly drawing a new one. You can use the Polygon Selection Mode to select grid nodes as well. 

1. From the main toolbar, click Add a new polyline button then start drawing the polygon by LMC and end by RMC (the polygon overlays the grid) as shown in Delete Grid Node. In case, the polygon file is available from an external source, skip the drawing polygon steps and load the polygon file into the workplace.
2. Select the Select object button from the main toolbar, select the overlay layer (the polygon layer) in the Layer Control panel and then LMC on the polygon, it will be highlighted.
3. LMC on the grid layer in the Layer Control. it means selecting the grid that we want to delete nodes.
4. The selected polygon is still highlighted, now RMC to display options. Select Delete Grid Nodes Inside the Selected Polygon to delete the grid nodes inside the polygon or selecting Delete Grid Nodes Outside the Selected Polygon to delete the grid nodes outside the polygonas shown in Delete Grid Node.

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