ms project : issue in wbs number reset - scheduled-tasks

Question

I have project schedule as below. I need start wbs from number 1 from kick-off meeting. Till Kick-off, I used customised wbs code, ie M1,M2,M3,M4. it is working. From from kick-off meeting on wards I need to start 1 1.1 1.2, 2, 2.1, 2.2 etc
Existing schedule
WBS Task name
1 M1: Milestone1
2 M2: Milestone2
3 M3: Milestone3
4 M4: Milestone4
5 Kick-off meeting
6 Requirement
6.1. Requirement collection
6.2. Requirement priority
6.3. Finalise requirements
7 Design
7.1 High level design
7.2 Low level design
8 Implementation
8.1 coding
8.2 code review
9 Testing
9.1 Test plan
9.2 Test case preparation
9.3 Start Testing
10 Delivery
10.1 Deliver to customer
10.2 Release resource
I need to change above WBS with wbs code as below.
Expected schedule
WBS Task name
M1: Milestone1
M2: Milestone2
M3: Milestone3
M4: Milestone4
1 Kick-off meeting
2 Requirement
2.1. Requirement collection
2.2. Requirement priority
2.3. Finalise requirements
3 Design
3.1 High level design
3.2 Low level design
4 Implementation
4.1 coding
4.2 code review
5 Testing
5.1 Test plan
5.2 Test case preparation
5.3 Start Testing
6 Delivery
6.1 Deliver to customer
6.2 Release resource
I tried with Project --> wbS -> Define code and Renumber, but both are not working.

Answer 1

Use a custom outline code, not the built-in WBS field. Then you can make it any way you want. Name the custom code CWBS or PWBS or something like that so you can tell them apart.