Where's my thinking mistake?:
First I create a project, let's say: building a cupboard
There I brainstorm the thing's I have to do:
1. Measure the sizes for the boards
2. Buy boards in the Wood-Market
3. Buy handles in the other Store
4. Build cupboard

As you can see, I planned ahead what I will have to do.
So now I have 1 next action: -> 1.
Afterwards I'll have 2 next actions: -> 2 + 3
Then again 1 next action: -> 4

So the question is: where do I put no 2, 3 and 4 while 1 has the state "next action"?
when you add to do's to a project all get the "next action" category.
No category is not possible. So I have to change the others to "someday" which is ridiculous because that should be a list of things I want' to do someday and I only look at this list from now and then.

How do you handle this? Or am I the only one who already plans a project like that?
Should I only add the first ToDo and think about everything again when I did the first one?