Fill a subgrid in quote entity after revised with the same data

Hi there All.
I Have a Subgrid in Quote, in which there are records of my custom entity, And also the custom entity display in left side of the form,Because the custom entity has N:1 relation with quote.
Every Quote can have many of my custom entities  record.
It is ok,But when I revise the Quote, I want that the same data of previous subgrid display in the new quote subgrid, as well as other fields that copy and appear from the previous subgrid.
Is there any solution or something like that?