How can I add extra customer information in POS without using the company field?

[Cpuga]

How to add new extra information for my customers in POS?

If there's a way to do it in checkout extension with metafields how its possible i cant add this same information into POS customers ... 

This is a huge problem when need to send the same information to any ERP or financial system on the country.

Any idea how i can add my customers ID without using company field?

Regards,