Well.

For this you can create your own groups and assign the access rights to it.

There are some existing groups in Odoo.

You can also inherit those groups in your group so that all the access of those two groups will be given to your group.

Using groups you can add views, menus, actions, access rights record rules etc.

For this you can follow the following steps.

1. Go to Settings and on the dashboard you can see 4 tiles in the 4th tile you can see a link called activate the developer mode.

2. Click on this which will activate the developer mode and add some more menus under Settings.

3. Now go to Settings/Users/Groups menu.

4. The groups are similar to roles. Here you can decide what this role will be do. You can first create the access rights, menu access what this group will be able to see. Then you can add users to this group and users of this group will be able to do only the things which they are suppose to do.

5. Similarly you can create an another group and you can add other users to those groups and they will have the access of this group. You can assign group in the users as well.

Let me know if you need more information on the same.