Is there a way to create an additional usertype?

Simply create a Role and select the appropriate rights for each module as required:

https://support.sugarcrm.com/Documentation/Sugar_Versions/9.0/Ent/Administration_Guide/Role_Management/ 

There are only 2 types of user in SugarCRM

i) Regular user

2) Admin user

for making a user-specific to any module or access level, you need to manage it with a combination of team + Role.

In your case, ideally, you need to create a Role named "limited user", then allow it whatever you need.

Moreover, if you want it to limit with certain record set on listview, create a team something like "limited user team" and make your default team for those users who should inside this team and Role.

Hope this helps!

There are only 2 types of user in SugarCRM

i) Regular user

2) Admin user

for making a user-specific to any module or access level, you need to manage it with a combination of team + Role.

In your case, ideally, you need to create a Role named "limited user", then allow it whatever you need.

Moreover, if you want it to limit with certain record set on listview, create a team something like "limited user team" and make your default team for those users who should inside this team and Role.

Hope this helps!

Thank you! I have manged it with creating new roles.