My company is planning an internal consolidation of three divisions into one division. We currently use the following designations to separate out the divisions (and drive integration transactons to the ledger dimensions):

Division 1: (1's and A's)

Series 10-19
Warehouse AAA-AZZ
Item Group: SA1000-SA1999
Workcenters AAA-AZZ and 100-199
-etc.

Division 2: (2's and B's)

Series 10-19
Warehouse BBB-BZZ
Item Group: SA2000-SA2999
Workcenters BBB-BZZ and 200-299
-etc.

Division 3: (3's and C's)

Series 30-39
Warehouse CCC-CZZ
Item Group: SA3000-SA3999
Workcenters CCC-CZZ and 300-399
-etc.

After the consolidation, the new entity is going to use the following designations:

New Division:

Series 10-39
Warehouse AAA-CZZ
Item Group: SA1000-SA3999
Workcenters AAA-CZZ and 100-399
-etc.

Below I have provided a checklist of what I plan to do in order to rebuild the integrations since there are no integration set up to map division 1's designations to 2 and 3, division 2's to 1 and 3, and division 3's to 1 and 2.

Please take a look at my checklist and offer any suggestions.
I just want to make sure that I am not going to miss something significant.
Thank you very much!

Prior to switch date:
Rebuild Integrations in Company 795 (this is a test company)

Date of Switch:
Prevent all users from accessing Company 786 (this is the live company)
Post Integrations in 786
Fix any Erroneous Integrations in 786
Post Integrations to make sure there are no more Erroneous transactions in 786
Export Integration tables out of 795
Import Integration tables into 786

You should be fine. I assume that you will test the integrations in the test company first.