issue with creating sub-menu from product categories

[firojalamParticipant]

Hi,
I am having problem with adding sub-menu.
here is my site: https://bichitracomputers.com/#
I would like to have many like accessories. But in the manu creation page under categories, product categories are not appearing. Can you suggest how can i add that? You can check this screenshot: https://www.screencast.com/t/vmj2cjLL

Thanks

Firoj

[Author]

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