Budget per Ad?

Hi,

I'm building a tool that I'm hoping to simplify creating Ads for our clients, similar to Adwords Express.

I've been instructed to just create a single campaign and adgroup for each client, which all ads would be under.  

Can I set a budget for each single Ad in this case?  Or does a budget have to be at campaign level and apply to all ads within?

Is there a recommended pattern to follow when simplifying Ad creation and hiding campaigns/adgroups?

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