I have make a receipt page with a custom taxonomy like 'lunch, diner, breakfast'.
Now the standard WordPress taxonomy select box is at the side right.
I want it in my custom field section.
Is is possible to make a custom field that is related to the taxonomy so that I can hide the taxonomy at the side?
Yes, it is possible. You can use the field taxonomy to select taxonomy for the post like the default taxonomy box of WordPress. You can also edit the custom taxonomy, disable the option Show on edit page in the Advanced tab to remove the default box. https://docs.metabox.io/fields/taxonomy/