Dropdown List and Dependent Dropdowns Creator

Help me create dropdown lists in my spreadsheet:

**Dropdown Type:**
- [ ] Simple dropdown from list
- [ ] Dropdown from named range
- [ ] Dependent/cascading dropdown (choice affects next dropdown)
- [ ] Searchable dropdown
- [ ] Multi-select dropdown

**Simple Dropdown Details:**
- Cell(s) for dropdown: [e.g., B2:B100]
- List values: [list all options or range containing them]
- Allow other entries: [Yes/No]

**Dependent Dropdown Details (if applicable):**
- First dropdown (parent): [e.g., Select Country]
- Second dropdown (child): [e.g., Select City based on Country]
- Third dropdown (if any): [e.g., Select District based on City]

**Source Data Structure:**
[Describe or paste how your source data is organized]

**Additional Requirements:**
- Error message for invalid entry: [Yes/No - what message]
- Input message/instructions: [Yes/No - what message]
- Alphabetical sorting: [Yes/No]
- Include blank option: [Yes/No]

**Platform:**
- [ ] Excel (version: ___)
- [ ] Google Sheets

Please provide:
1. Step-by-step dropdown setup
2. Named range configuration
3. INDIRECT formula for dependent dropdowns
4. Data validation settings
5. Maintaining and updating the lists
6. Troubleshooting common issues