Adding computed item pricing (dynamic discounting)

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I'm looking for technical help on how one would add dynamic pricing.  Could be a java script side where pricing is calculated through java script before being added to cart (custom cart item with custom pricing???) is this possible?    


I have other situations that would require ability to add custom priced items to the shopping cart.   So having discount coupons is not enough control.  Example is when a customer purchased a new item and for subscription renewal purposes the pricing needs to be prorated to a specific date.


Is any of this possible?