R2600 device and tenant/partition configuration

What do you want to accomplish?
Partition != Route Domain.
Partitions are primarly use to give proper permissions for different administrator groups.
RouteDomain is VRF in F5 world and is necessary to use same IP subnets for different domain.

Here is good example of Route Domain configuration:
https://www.linkedin.com/pulse/f5-lab-119-configuring-route-domain-deni-ramdani-xivqc/

For r2600:
1. Create tenant on F5OS level; select all necessary vlans*
2. When tenant is UP, start with preparing partition/rd
3. Remove vlans from Common and recreate each in specified partition/rd
4. Then rest of configuration: SelfIP, routing, etc but always select proper partition or use %RD notation for IP addresses

*there was a limitation that vlan can belong to one interface (phys/LAG), changed in F5OS 1.8.0:
https://techdocs.f5.com/en-us/f5os-a-1-8-0/f5-rseries-systems-administration-configuration/title-tenant-management.html