How to update the multi-select picklist set of values while import

Guys,

It's very tedious to enter set of values in multi-select picklist while importing. Firstly we need to enter the set of values after then only import is working. However, it should automatically add the new pick list values in the set of values in multi-select picklist when the values in not define there.

In my case , here is the error I'm receiving.

"Oracle CRM On Demand was unable to import the multi-select picklist values 'Astro Reps.,Aztec Enterprises Inc.,CMA Inc.,Cian White,AmitSingh' because one or more of its values did not belong to the set of available values.  You may want to update the multi-select picklist values for field 'Sales Rep'"