I have a table related to its child,(that holds related data),the relation is built by auto generated serial(like usual)

The portal works all fine and always create a new records as its past on is filled.

But i want to create a button that creates new rows without being needed filling past records.

Will help alot in IWP!!

I'm not exactly sure what you mean, but one way to create a new related record is to grab the parent record's ID:

Set Variable( $id; ID )

... then go to a layout based on the child records; create a new record; and set the foreign key to the variable: 

Set Field( Parent ID ; $id )

... then go back to the original layout and you're done!