To merge events, the first thing you should do is move your placeholder (i.e., the manually entered) event to the same start time as the Byga system event). You can do this by dragging the event or clicking on it and changing the start time. Make sure the manually entered event type (game or practice) is the same as the system event you would like merged.
Then, go to the team's calendar page. You can then merge events using the pop up on the left of your screen or navigate to the team's directory and merge from the menu to the right of your team.
By using the menu option from the team directory, Byga will search your future events and find duplicates (same event type and same start time). It will present those and you can select the ones that it can merge for you. In rare cases the merge is not possible (e.g., multiple Byga system events with the same start time).
The latest availability response from each player is preserved. And any event notes are preserved.
This feature can only be accessed on the web version, or by going to the web version from the mobile app under the "more" tab.