Hi carmy63,
During the creation of the BM it is necessary to set the cardinality to 0 to N in the relationships between the fields of the tables https://knowage-suite.readthedocs.io/en/7.4/functionalities-guide/meta-web/index.html?highlight%20=affari#crea-una-nuova-relazione
After generating the model, go to MyWorkspace, select the model you created and add the fields involved in the relationship. Using the three-dot menu at the top right of the page, you can access the "join definitions" dialog where you can select the type by choosing between INSIDE, LEFT or RIGHT.
GreetingsAlberto