How does one create a sub project? I'd like to know how to do this both on the mac & on the web.
Both the Mac & Web are the same. Right click the task, edit, and then you can see the two arrows on the right hand side (under the date box). This will change the Indent Level.
This will make whichever task is above the sub task the parent task. This can only be done within the Project view.
OK, so that means there are just different indent levels, which stand in for tasks and sub tasks and there isn't something else that is a sub project?
In particular I want tasks to LOOK different from projects and sub projects--not just by indent level.
Using this scheme in one project one indent in might be a task, while in another project the tasks might not show till you are several indents in:
Sorry about that. I read Project as task. Yes, you can have sub-projects. It works the same way though, just get the project in edit mode (right click, edit) and change the indent level.
Though, I am not sure by your look different question?
how do project & sub project share ?
Each project (regardless if it's a main project or a sub-project) needs to be shared individually.
It appears that sub-projects are user-specific. So, if a company admin makes a sub-project, the company's users do not see that. Is this correct, or is the "indenting" across the entire org?
Each project is its own, each user would need to re-indent each one.
From a business customer perspective, projects should be "owned" by the business. Arranging things by project/ sub-project should also be "owned" by the business. I guess this is a wish list.