Bazaar shared repository structure with/without working tree

Question

I'm using bazaar with the following shared repository structure on network drive:

proj_name (shared repo **with working tree**)  

.bzr  
developer a (integrator) (FOLDER)
    trunk      (branch)
    feature a  (branch)
    feature b  (branch)
developer b (FOLDER)
    trunk      (branch)
    feature a  (branch)
    feature b  (branch)
developer c  (FOLDER)
    trunk      (branch)
    feature a  (branch)
    feature b  (branch)
formal version (branch)

I want that formal version branch will be branch without working tree, where all the other branches will be with working tree.
Is that possible?

NOTE : I tried to create the formal version branch with bzr push N:\Projects\proj1\formal --no-tree but its still create the working tree

Answer 1

I found two solutions for this probelm:

In case of existing branch with tree you need to use 'bzr remove-tree PATH (Solution from Martin Pool)

In case you want to create branch without tree , the bzr branch --no-tree is what you need (Solution from jelmer)

Notes:

1. bzr push PATH --no-tree to a PATH that's not exist , will create branch WITH tree.
2. Once branch is created without tree or remove-path was executed , you can
   use push with or without `--no-tree switch and the branch will stay without tree.