Hourly availability

I want to be able to offer certain hours of the days as available - three hours in the morning, two in the afternoon, for example. 

I havea  number of products on offer (I do online social media training) and so if someone books one session for e.g. 11am for an hour, I would like this to be blocked out as availability on each of my products. 

Is this possible? 

Also, the hours don't show up in the drop down box - can I show this as a linear option, like in your example for hourly bookings?

Many thanks
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