Hi @SilviyaRadkova, welcome to the forum and thanks for taking the time to share your feedback with us!
We have a couple of feature request threads related to the topics you mentioned, I suggest you to upvote here:
- Create (multiple) tasks easily in Android
- Copy Task on Mobile
- Create Sections within Subtasks
- Allow to duplicate tasks from the mobile app
We systematically monitor feature requests in the forum in order to considerer future updates.
Thanks again and let me know if you have any other questions.