Multi select and Update Record from Detail based on an Existing Section in Creatio

Hi,

We have created two sections : "Deliveries" and "Vessel Requests".  We have added Deliveries as Detail in Vessel Request section. we will to add existing records from + button without creating new objects. when added, the selected delivery records should be updated with the current vessel request. Please refer to the screenshot below.

Please help and advice.

Thanks,