Excel Gantt Chart for Client Tasks

I need a Microsoft Excel spreadsheet that will allow me to manage tasks and calendar updates for 60 clients efficiently. The spreadsheet should include a dropdown menu to select a client, which will then update a Gantt chart to visualize the client's calendar.

Requirements:
- Excel-based solution
- Dropdown menu to select from 60 clients
- Gantt chart for visualizing calendar updates

Ideal Skills:
- Proficiency in Microsoft Excel
- Experience in creating dynamic dropdowns and Gantt charts in Excel
- Attention to detail and ability to create user-friendly interfaces