vbulletin 4 profile field help needed?

[nam6641]

hello i have create a new registration user profile field as below:
Profile Field type: Single-Selection Menu
Title:: Marketing Experience
Options: Select your marketing experience.
1 year
2 years
3 years
5 years.

Set Default: Yes But No first blank option
Display order: 6
Field Required: Registration and profile page
Field editable: yes

Here is the details, and after some searching i am able to show these value on a postbit under usertitle. But one issue is that i don't want to show the exact option selected, i want to show like this
If a user select '1 year' marketing experience during registration the text 'rookie' should be displayed on postbit. Can you please tell me how can i achieve that.

i want to display the value as shown
If a user select option

1 year = Rookie Marketer should be displayed on postbit
2 years = Scalper Marketer
3 years = Technical marketer
5 years = professional marketer

Please anybody help, need it done urgently.

Thanks In Advance.