Make new table based on values in multiple colunms

Hi

I have a table that contains informations about agreements.

Some of the agreements are Main agreements while some are Sub-agreements to the main agreement. Main agreements are the ones were field Originating agreement is empty. Agreements can also have different agrement types.

I can easily make a list of the main agreement, but I have difficulties with making a list that contains only agreements related to originating agreement, like this:

I guess I can make a new table, but I'm in doubt how I can filter this selection?

Any suggestions?

Regards Hans