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Room templates: You can set joint requirements for several rooms by using room templates. You would use this if you need several rooms of one type for a project, possibly for several functions. Room templates are described in Room templatesTemplates Overview.
Requirement group: You can set joint requirements for parts of the room (parts of the RDS form) which are common for several rooms, possibly for just one discipline, applicable to all room templates. The use of requirement groups is described in Groups.
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