- Create a Custom Vtiger Module: create a new custom module. Without a single line of code.
- 1:1 Relationship: creates a one-to-one relationship between 2 modules. So that only one record will be linked to the single record from another module.
- 1:M Relationship: create a one-to-many relationship. So one record from the primary module is linked to many records from the secondary module.
- M:M Relationship: create a many-to-many relationship. So many records from one module are linked to other records.