When you install Civil 3D 2013, you have to expand the accordian to get access to install the following Sub-Components:
- Autodesk Storm & Sanitary Analysis 2013
- Autodesk Subassembly Composer for AutoCAD Civil 2013
If you create a deployment and you do not select those components, you will NOT be able to add it in the deployment afterwards if you try to Create & modify a deployment [in the Tools folder].
To solve this problem, run the setup of AutoCAD Civil 3D again on the target computer. It should will alert you that AutoCAD Civil 3D is installed. Just expand the accordian to install the 2 sub-components.
You can re-download Civil 3D 2013 using the Virtual Agent (Step 3) here:
Thanks to Avto Chachava for this workaround.