Please add into the product documentation section about linked decision tables. The community documentation can be found at: https://docs.jboss.org/drools/release/latest/drools-docs/html_single/#_guided_decision_table_editor_new_editor

It could be useful to provide examples of columns that will be linked:
If one table contains columns that

$a1.setSalary(5000)

and another table contains columns that

$a2:Applicant(salary > 1000)

then such two tables will be linked. Please notice that the fact has not to be bound to the same name. It is enough that fact is of the same data type - in this example Applicant.