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Profile sets 
A profile set consists of individual marketing segments - profiles, target groups and other profile sets - which were modeled together and which are to be interpreted together.
In the Segment Builder, profile sets act as folders grouping together the marketing objects profile, target group, and profile set (subset).
Where a profile set is to be interpreted as a subset, this means that it is used to create the logical "OR" relationship for creating target groups.
Namely:
Profiles are created using selection criteria linked together with a logical "AND". The logical "OR" that may be needed is created by combining multiple profiles (and/or target groups) to form a subset.
This subset can be interpreted as a union of the profiles (or target groups) it contains. If, to enable further processing of the subset a corresponding target group is created (referencing the subset and not a profile) this target group contains the union of the business partners contained in this subset (that is, duplicates are removed).
In terms of profiles, the subset therefore represents the logical "OR"; in terms of target groups, it represents the duplicate-free union of the business partners.

You can create a
subset for a profile set, but you cannot create another subset for this
subset. In this sense, no more than two "levels" can be
created, that is profile set
® subset.
The following graphic illustrates the relationships described above.
