You can only enter 1 combined-event per category in Athletics.app. You cannot make choices within a heptathlon, a heptathlon is a fixed set of events that every athlete is supposed to do.
Other organizations sometimes solve this in several ways:
1) No heptathlon point total is needed (single events)
If you don't need a heptathlon final score, you can choose to put all the events there as single events in Athletics.
If you want to limit the choice (e.g. because events are at the same time and an athlete cannot do both events at the same time) set the timetable in advance and through the right-hand management menu via 'Online registration settings' set 'Prevent registration on simultaneous single events' to YES.
You can also put an extra piece of text there 'Show information during/before registration to each athlete/registrant', there you can explain what the rules are, each athlete will see that while registering.
2) You only have a total of 2 or 3 choices in the combined-events
Make 2 or 3 competitions, read more here: https://www.athletics.app/faq/?qa=91/two-single-events-create&show=91#q91
This way you will have multiple combined-events leaderboards, with all the different 'choice' combined-events in separate leaderboards.
3) Create a 'giant' combined-events
Set up 1 combined-events for the category and enter all possible single events there. Athletes will appear on all judges' forms by default, from all events. Then, using pen/pencil, cross out the athletes who do not participate in certain events.
This will give you 1 combined-event leaderboards, with all the 'choice' combined-events mixed in.
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This has been automatically translated into English