List with checkboxes, unable to make some line a dotted ite

[RemcoV 3]

In a list of tasks, I have a few sub-items which do not need to be completed but are context. I want to make that a dotted list. But once I have created the checkbox, I cannot change it into a dotted list. Is there something I do forget?

[ForestD 1,618]

I might not be totally following. 

Is this what you are trying to do?

[RemcoV 3]

Yes, but when I adjust the checkbox into the dot, all remaining checkboxes are adjusted as well

[ForestD 1,618]

If you indent a checklist item such that it is indented more than the others, then you can change it without changing the rest -- then indent it back.

For example, indent Line 4:

Then change it to a bulleted list:

Then indent it back: