how Can we draw piles in soft plan instead of footings?
It depends largely on the design. Since you didn't provide an image or drawing of what you are trying to do I'm just guessing here.
Select Draw-->Post-->Structural. You will find several options including pressure treated posts, block piers, concrete piers, etc. After you insert one you can edit it and change the sizes and shapes of the posts, piers, and pads to match your requirements.
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