To list a collaboration project as a company, you can do this easily in the MEDIA tab. 

You can post any project that your company is offering and choose up to 2 verticals you want to publish it on.
You just have to fill in the form describing as much in detail as possible all the aspects of the project. 

Once published, it will visible on the platform feed of the verticals of your election and all the interested community members will be able to contact you.