Yes, for each market/advertiser, the Segment Builder automatically stores an associated impression sharing contract that allows you to build audiences based on impression exposure.
To apply a re-targeting audience to an upcoming campaign, build out your audience in the Segment Builder—as you would with any custom segment—prior to the campaign launch. However, keep in mind that each user profile has a 30-day period to live in the Amobee DSP, starting from the day of exposure. Once the profile of an ad-exposed user has reached its 30 days in the Amobee database, you may no longer be able to retarget that user.