Hi Gael, You can take advantage of model access(access rights) and records rules(access rules) in Odoo. So for example, your model 'product' has many records. You will need to defind two group of users, one group only having users in Europe (group A), other having users not in Europe(group B). So some records in the model 'product' can only accessed by users from group A. Users from group B can not see or access to them. You should read the section 'Security in Odoo' for suggestion.