All Autodesk Inventor project types can be modified to become vault projects.
The general process for getting legacy (existing) Autodesk Inventor data into the vault is to consolidate the Autodesk Inventor design files and the associated .ipj file so that it appears to be a single-user project with references only to libraries. File organization is the key factor when vaulting existing projects.
When working with Autodesk Inventor project, you must have all related data to a particular project within a single project file. If you have more than one logical project under a single project file, break them apart. For example, if your company makes two different computers (Computer A and Computer B), you must have two Autodesk Inventor project files, one for each. You can use common parts and library parts, and share and reuse these files between the two designs.