How To Create Form that has Table data type in it

I would like to create new form (new doctype) that has field name type is Table, but unfortunately I use the Table data type to create a new data on linked Table data type, how can I just insert data from Table data type without create a new record on that?

My forecast, Table data type will create a new record, but the purposes is, i would like to take a record from Forecast Product only