There are 2 ways to combine queries and criteria to create more complex queries
This feature allows you to combine two existing queries. e.g. "Which participants are in both queries?" or "Which participants are in Query A but not in Query B?".
See How to merge two Queries
By default the Query Builder requires that all of the criteria are true. In some cases you may want some criteria to be combined using either/or, e.g. "Participants who are either in HRT or are Hispanic"
See How to combine criteria using "OR" subgroups