Start with two tables ... one for Rooms and one for Tasks. Connect the two tables within the Relationship graph by
Rooms::ID = Tasks::RoomID. where Rooms::ID is the primary key of that table and the field RoomID in the Tasks table is the linking field to Rooms. eg. the foreign key field. You can then place a portal on the Room Table layout showing tasks for that room, from the relationship you just built.
I think you have to consider a join table between tasks and rooms because their is probably a many to many relationship between the two entities.
not from his description of the problem