Errata/package handling in satellite server with cloned channels

Hi!

I have the following channel structure:

RHN synchronized channels (Red Hat Enterprise Linux (v. 6 for 64-bit x86_64) and child channels) cloned to engineering (sandbox).

engineering is cloned to development

development is cloned to test

test is cloned to preprod

preprod is cloned to production

I have never grasped errata handling in satellite fully. How do you clone/add/copy errata and new packages from one cloned channel to the next stage in the hierarchy? The errata cloning / publishing is very slow and cumbersome, what if I need to add 50 errata?

Best regards,

Erling