[FEATURE] Subgroup or Subcategory

[KavinFelixSK]

Please confirm the following:

• [X] I've checked the current issues for duplicate issues.
• [X] I've requested a single (only one) feature/change in this issue. It complies with the One Request Per GitHub Issue (ORPGI) rule.
• [X] My issue is well-defined and describes how it should be implemented from UI/UX perspective.

What do you want to be added or improved?

As a user I want to able to add subcategories under main category

Why do you need it?

• Category is a broader term, inaddition to that having subgroup will help in narrowing down the spends across categories

How do you imagine it?

No response

[ivywallet]

Thank you @KavinFelixSK for raising Issue #3146! 🚀 What's next? Read our Contribution Guidelines 📚.

Tagging @ILIYANGERMANOV for review & approval 👀