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Ankita LAnkita L 

hello, i am new to sfdc please help me.

Create APP, 2 create component with record edit form and hard coded Booking ID 3. add button "Create Project" and 4. It should update booking record with some value in project number field without touching on ui.
ShirishaShirisha (Salesforce Developers) 
Hi Ankita,

Greetings!

You can create the Lightning Application and call the lightning component to achieve the same.Please refer the sample lightning component code to create the Project button.

https://salesforcediaries.com/2019/05/26/quick-create-record-dynamic-lightning-component/

Kindly mark it as best answer if it helps so that it can help others in the future.

Warm Regards,
Shirisha Pathuri