There are not " Add Cell to Up " and " Add Cell to Down " .

Hello Yul,

Thanks for contacting us

Question 1 )
Can I insert any grid into grid through grid layout ?

Unfortunately, no, it's not possible

Question 2)
There are not " Add Cell to Up " and " Add Cell to Down " .
Is there any reason ?

Unfortunately, the same related to the cells, it's not possible. There's no specific reason behind that, it was designed in this way.
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Sincerely,
Ahmad M.
Nicepage Support Team

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I see.
Thank you very much.