We need support for new software or can we use this software for our other projects or subsidiaries

If you are using QBO Plus

https://quickbooks.grsm.io/Middle-East

You may utilize the Project feature

https://quickbooks.intuit.com/learn-support/global/getting-started/set-up-and-use-the-projects-feature/01/381561#M23

and/or turning the class feature for multi divisions in your company

https://quickbooks.intuit.com/learn-support/global/help-articles/turn-on-class-tracking-in-quickbooks-online/01/512331

Another option, consider having a project management app for more features to integrate with your QBO account.