Hi,

You can create custom reports in Odoo using the Studio application. Here are the steps to create a report in Odoo using the Studio application:

1. Go to the Sales application and click the Studio icon in the top right corner of the page.

2. On the Studio screen, there is an option named "Reports." Click that Reports option.

3. There, you can create a new report and customize it using the features provided by Odoo.

4. Use '/' the various built-in options to customize the report and save it.

Please refer the below video for further clarification.

https://www.bing.com/videos/riverview/relatedvideo?q=odoo+report+customization&mid=E83C033CE228032467ADE83C033CE228032467AD&FORM=VIRE

Thanks.