●Subforms are layout-specific. Create different subforms for different layouts
catering to your requirement.
●Using lookup fields, include fields from the lookup module to the subform.The
fields included from the lookup module will not sync with the subform. For
example, when you change a product description in the subform, it is modified in
the subform but not in the original Product module. This is because, you only
make an association here, but not synchronization.
●Using an aggregate field, you can use predefined aggregate functions (SUM,
AVERAGE,MAXIMUM and MINIMUM) or Formula functions. For example, when
line items are added in the products subform, the prices will be added up
automatically. This is done using the SUM function.