Find Event Frames that belong to multiple Event Frames templates using PI System Explorer and PI Builder
The OR clause is planned for AF 2018 SP2 and will be available in PI Builder, although it requires typing of the OR clause directly in the search box - for example: "Template:T1 OR Template:T2".
In AF 2017 and later, you can also include multiple templates IF you can identify them by name with wild card using the TemplateName filter. For example "TemplateName:T*". Note that this clause must be typed into the to search box - there is not an independent control on the search form.