How do updates change objects?

[je_hpf]

I don't have a lab system to test out on unfortunately.

Say I create a group policy using this call.

Then say I "update" that group policy using this call. When I use the latter, will it overwrite/replace the group policy with what I supply, or will it only update the individual exceptions?

For example say I create a group policy with some scheduling options. Then I update the policy and only supply some L3 firewall rules. If I don't specify the scheduling options in my body for the update, will they be replaced with $null (removed)?

[Ryan_Miles]

You should be able to test this even in an empty org. Meaning, create a new org that has no hardware or licenses. Enable API in this new org and run your commands.

[John-K]

Ry's right! General rule is this: if you specify a field that's not required, we'll overwrite it. If you leave it out, we generally won't overwrite it. This is pretty consistent across API AFAIK.