Packages: select service category for sessions usage

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I have packages in my website which contain different number of service sessions (for example 4/8/12 sessions).
Now, for some reason, I can assign service and assign the number of sessions I want to assign for this package.
However, I want to be able assign 'Yoga' service category which contains all 'Yoga services' and the client can choose which service he want if he have package.