Is it possible to change the criteria for an existing Sync in Campaigns

Is it possible to change the criteria for an existing Sync in Campaigns

I have many more Contacts in CRM than I want to Sync with Campaigns at present. Plan is to move them across progressively based on the value of a code.

But to do so need to set a new SYNC each time a new set of Contacts is to be moved across.

Having to remap etc etc is very tiresome. Not much easier to use export and reimport.

What I want to do is maintain Contacts in CRM and use Sync to do the work automatically.

If Edit existing isn't possible, why can't an existing Sync be cloned and then amended?

Campaigns seems to be very inflexible in this area.

THX

David