You can add Investment Thesis to your portfolio company in the below two ways
My Investment Theses Page
You can add Investment Thesis to the 'My Investment Theses' page directly by accessing it under Products > Sector Research > Investment Theses > My Investment Theses
Use the 'Add Investment Thesis' option at the top right corner.
Company Details Page
Search for the desired company in the 'Global Search' and click on the ‘Funding and Investors’ and select ‘Investment Theses’ page.
Update the Investment Theses Window
In the "Investment Theses" window you can update the details such as Company Name, Investor Category (Angel, Corporate, Incubator, etc), Invested Round, Thesis Description, and Article Links and Publish the Theses.