You can drag and drop all radiators in the project into the scheme at once. It is also possible to place single radiators specifically in the scheme by drag-and-drop. You can determine the pipe run assignment of the radiators beforehand in tabular form in the Radiator Dimensioning module or you can do this by moving the radiators to the corresponding numbered pipe run button after the transfer in the scheme.
About Inserting Dimensioned Radiators into the Scheme
Explains the concept of transferring dimensioned radiators to the pipe run scheme.