Every project has its own calendar link, which syncs the schedules, tasks and events for that project only.
Step 1: Open the project's Calendar
Navigate to the project, click Project Management in the sidebar, then click Calendar.
Step 2: Open Calendar Integrations
Click the Calendar Integrations button in the top right and choose Google Calendar, Microsoft Outlook or Apple Calendar.
Step 3: Copy your link
Click Copy Calendar URL to copy the link to your clipboard.
Step 4: Add the link to your calendar app
Follow the instructions in the popup. The steps in your calendar app are identical to the Workspace Calendar integration. The only difference is where you copy the link from and what it syncs.
Your calendar will now pull in the schedules, tasks and events for that project only. Repeat for any other project you want to connect.
Read the full article: How do I sync a single project to my external calendar?