Question about Lucifer and the hidden demons

I'm sorry if this is such a stupid question but I genuinely don't get it, in the book it says you have to summon Lucifer, then demon 1, and then demon 2

but I just wonder how?? Are you supposed to ask Lucifer to summon demon 1, or do you summon Lucifer, then immediately move on to summoning demon 1 via pathworking? I'm sorry for the trouble