Hi, Zo

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

What you are asking about is packages of services. Packages of Services is the only feature that is not included in the Basic license, the rest of the features are absolutely identical.
Packages of Services is a feature that allows creating packages of multiple appointments (of the same or different services). In that case, the services that are included in the package and the number of appointments will be fixed, and the price will be set for the whole package. Customers will be able to book included Appointments on any days, with no strict recurrence. You can see more information here.

Look at packages as gym packages. For example, you have "Gym access" service, "Treadmill" service, "Bike" service, "Spa" service, and so on. You can create a package that includes all these services for a reduced price. 
So, you create a "Full access" package, where all these services are included. You define the number of appointments per service, and allow your customers to book all these services in one go.
So, a customer can book this package, and book "Gym access" for 5 days (free for choosing), "Treadmill" for 3 days, "Bike" for 2 days, "Spa" for 7 days, and so on. You define the number of bookings for each service. 

More information here.
Let me know if you have further questions.

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Additionally, I just wanted to point out that we have pages with Demos, that you can use to try out some of the plugin's features - https://wpamelia.com/demos/

and there is a 15-day money-back guarantee period,
So if you purchase the plugin, you can safely fully test it out,

we will be here to provide any assistance along the way,
and if it doesn't fit your needs you can request and receive a refund in that period.