How to add attributes to preference management in

I want add custom targets in preference management ESI --> Settings --> Targets

how can i do this? .... I tried solving it in three ways but i am stucking at every procedure at some point

1) Tried doing customization by adding new actions in action model but in action model i didtn find particular model for ESI Target.

2) Tried Adding soft attributes to the Preference Management UI through Distribution Target Link in Type & Attribute Management .

3) Tried customization but i am not getting which resource bundle entry to add values

Please anybody help me to resolve this