My old POS software uses microsoft access database mdb. I can export from this database excel file or text file. I would like to import into Sambapos only my customer informations, this fieldname: name, lastname, phone, street, city.
If you can export the DB as CSV then you could import it into V5 using Scripting and the API functions. You cannot do this natively with V4 since it does not support scripting and there is no API in V4.