Add custom field to pos

hi
i want help in adding a custom filed in this place
i want add (second qty )

This is possible to do it using the POS settings. Just add the field you want and it will be shown in the POS UI.

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thanks but I would to add a custom field for each item in the pos Invoice,
like sce qty in this sales invoice items child table :

Not possible, you can add it in parent doctype and it’s visible in pos ui, not child doctype.

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Thank you for the response.
I’m looking for a tutorial or documentation to guide me through this, I need to know which file I should start with, as there are many files related to “POS.” Could you point me in the right direction? :smile: