You can ask the visa office to list your dependents as not accompanying. The visa office might however still want to see their DNA tests since they've already asked. Listing someone as not accompanying means they don't get the PR visa at this point but can be sponsored later.
It is not your choice to remove your dependents from your application but can happen if they reach the age of majority, you give them up for adoption or you are unable to access them for medicals based on for example being divorced from your husband and him having full custody. Any dependents completely removed from your application can not be sponsored later.