When you upload the LinkedIn CSV file all your colleagues will have access to the same contacts.
The contacts you have uploaded will only be available for your colleagues and not available for any other company on Companybook.
Here is how to get started
Download your LinkedIn connections
First download your network from LinkedIn by visiting this url: https://www.linkedin.com/psettings/member-data
Ensure you select "Fast File only"
Then follow the instructions and type in your LinkedIn password.
Open the link you receive in your email and download data archive.
Unzip the archive and find a file named Connections.csv
Upload your CSV file on Companybook
First click My Network in your Dashboard
Then select the CSV file you downloaded from LinkedIn and click upload
All the imported contacts will be listed under the LinkedIn contacts tab.
It's only possible to upload one CSV file at the time