Showing Option Set from another Entity ( with Web Resource?? )

Hi All,

I have a situation, that in Competitor Entity the Field Strength must be an Option Set  (as default it is a Multi Line Field). and user can select more than 1 Strength, this field also must have ability to give a Suggestion of the Strength that have been created before.

so after a short conversation we agree to create a Custome Entity "Strength" (only has 1 field - Option Set) and create N:N Relationship from Competitor to Strength.

what I need is transform the Field Strength (it is a Multi Line Field) to an Option Set with jQuery (MultiSelect & AutoSuggest) and retrieve the values from the Field Strength in the Strength Entity.

I have read some articles and references that say it can be done with Web Resource. 

anyone have some explanation or similar experience solving this issue?

Regards,

Rico