2 input messages into 1 output line 1 and line 2?

[ukmoose]

I'm confused as to how the flow you posted relates to the question you asked.
The flow has 3 inputs ( 2 alexa and one MQTT which looks like a switch)
so where does day and brightness come into your flow?

But if you want to direct message 1 and message 2 to different places use a switch node
as one payload is a number you can set a switch to is of type number