As shown in the figure the corner of following shape need to be removed to make it dashed line. I am trying to use knife tool to cut the portion of the line. But failed to do so. Is there any possibility to cut the part of the line tool?
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Scissor tool for stroked paths, Knife tool for Shapes – Scott Apr 29 '20 at 18:41
The knife tool won't work on an open path with a stroke. It only works on closed paths.
Example. The top line is an open path with a stroke. The bottom line is identical but has been Expanded to a closed path (outline) with a fill.
If you want a dashed line, it's probably easier to simply apply a dashed line to the stroke in the Strokes panel.