Cycle count synchronization mode

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When ever new items created in system, we need to add first in ABC classification set and ABC assignment groups with scheduled programs. We are good until here.

How to sync the items to cycle count?

Can we update 'Synchronization mode: Complete' under Primary details?

As I could see, we select 'Synchronization mode: Complete' initial creation of a cycle count. But here it is not initial creation and will this be impact on future count schedules or sequences as we are selecting complete mode?