How to enter waypoints below home altitude?

Ground Control Software Mission Planner
1

I live on a hill and need to enter waypoints below home alt. Entering negative alt’s does not work. I understand apmcopter does not support absolute altitute so how do I achieve this?

2

[wf]Copter software[/wf]
[mf]Copter/General[/mf]

3

solved as per
diydrones.com/forum/topics/absol … _com_forum