How can I generate checkboxs for field

hi all ,

I have a table contains the depts

and other one contains stores
in the the store table I have de_id field but it contains data like this

de_id = 147
I mean the stores can be a child for more than one department

what should I do to generate the de_id filed in the store page ( add / edit ) to display all of the depts like a checkbox and the user can check 3 of them ?
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