Hello Divya,
Create one DataGrid with selection mode multi select. Add one update button and on click Microflow event, it will pass list of selected object list and then you can play with selected object list.Is this your requirement, please explain more if not.
Divya,
If you are using a microflow button on the grid, you should be able to select either all rows of the grid, like this:
Or the selection the user made, like this:
If your microflow has a parameter which is a list of the objects in the datagrid, both of these options should be available to you.
Hope that helps,
Mike