Nikon D300 - Manual (Page 320)

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Follow the steps below to take photographs in commander mode.
1
Adjust settings for the built-in
flash.
Choose the flash control mode and
output level for the built-in flash. Note
that output level can not be adjusted in
[– –] mode.
2
Adjust settings for group A.
Choose the flash control mode and
output level for the flash units in group
A.
3
Adjust settings for group B.
Choose the flash control mode and
output level for the flash units in group
B.
4
Select the channel.
5
Press J.