Export Subset of Full Project

**Is your feature request related to a problem? Please describe.**
Yes. I frequently need to export subsets of my full projects for smaller scale testing. As of now I have not found a convent way of doing this. It seems like its all or nothing. This may be a feature that exists. I am just not aware of it.

**Describe the solution you'd like**
I would like to have the ability to select which tasks will be exported. I would also like a way to specify this via the API.

**Describe alternatives you've considered**
I have written code that just removes what I need from the full export, but is more cumbersome that it needs to be.