One SC splitting into different POs

Hi SRM Experts,

There is an incident where user is creating one SC with different line item and it is creating more than one PO while the Basic data are same ie Vendor/Source of Supply,Recipient,PurOrg,Prod Cat etc all are same.

Should purchaser use Submit to Grouping to make different line items into one PO?

When we use Carry Out Sourcing-in the extended search tab one field comes like Intended for Grouping (Chech box) what does it mean when we check this field.