We have suite CRM within our sales department and I now want to integrate with other departments in the company who interact with the same accounts, can I have multiple users on one account?
Currently it is available in one of the paid plugins.
https://store.suitecrm.com/docs/securitysuite/multiple-assigned-users
Note that the assignment mechanism is designed specifically for personal responsability - one and only one person.
Several scenarios where different team work is needed can be implemented with Security Groups - letting a group of people see only the records that they should see.
So if you don’t want to use the paid add-on, you can try this alternative via Security Groups ad Roles. A bit more complicated, but quite powerful.