Q:

GitHub combine repos into third repo from webpage

I have the following repository structure on GitHub:
DSL/preprocess/
DSL/postprocess/

In each of the folders preprocess and postprocess, I have a Readme.md and a Wiki...nothing else is in those folder (no code).
Now, since these repos are both for DSL, I am hoping to combine them into a new repository named BriQBDSL. However, I would like to to do this from the GitHub webpage.
Additional Information:

Since there is no code in either of the folders preprocess and postprocess, I am not concerned about history.
I can back up the Wiki pages (if needed - see below)
I'm working in Windows and don't have git installed (would prefer to avoid installing it).

Main concern:
My main concern is that the Wiki in both folders has quite a lot of subpages - backing up the pages would take some time. I would like to keep those pages intact during this proposed move.
Is it possible to combine these 2 repos into a new (third) repository named BriQBDSL through the website? If not, can this be done programmatically?

A:

Use submodules.
Create your new repository.
Inside the new repository, put a .gitmodules file with the following content:
[submodule "DSL/preprocess"]
    path = DSL/preprocess
    url = {URL OF YOUR PREPROCESS REPO}
[submodule "DSL/postprocess"]
    path = DSL/postprocess
    url = {URL OF YOUR POSTPROCESS REPO}

Run git submodule update --init from the base directory of your new repository. (I'm not sure if GitHub has this command available through the web site)

