Ability to include sub blocks when referencing block ids

[1stprinciples]

Thanks for the solution. I would like to point out that there are two drawbacks to this solution.

1. Having a space in between list introduces unwanted line spacing. (You can see this in your screen shot. Between one and two there is a line spacing)
2. Current solution prevents me from creating lengthier blocks. For instance, if I want to reference from one till something else, it is not possible in the current setup.