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Can someone advise how to create a multiline tab, similar to the one you see on an invoice form? I'd like to add supplementary info to a customer record to record different relationships they have, for which I would select from a list for one field and then manually fill in a couple of other fields. There could be multiple relationships hence needing to do this.

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Hi,

Seems the question is about adding the One2many field, for this enable the studio mode by clicking the studio button and add a new One2many field.

See this blog explaining the same:  Odoo Studio: adding a one2many field


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Thank you - I'd found that, but it doesn't explain how to do exactly the part I need, which is how to add a new multiline tab to an existing form, and for that multiline tab to enable me to create new records in a new model that will be linked to the model of the original form. So, the customer form already exists, but a list of relationships a customer has with other customers doesn't. So I need to create a new model "relationships", which then has to be related to the original customer model (customer code or name being the linking field). And when I create new lines, each one automatically is populated with the customer number/name that I am currently editing and I just fill in the info on the other fields.