Using Quick create form to add values from a lookup fields

Hello,

I have two lookup fields in my quick create form, I have a filter criteria I am using based on what is selected for field 1 it filters filed 2. I am using OOB for that. Instead of creating a new record, I would like to add what already exist in to the grid. I know the oob quick create a new record, how can I work around that to add an existing one?

Thank you!