# Dropdowns, locked cells, and links

Any cell in a Fusion spreadsheet can be converted to a dropdown using the `dropdown` and `multidropdown` functions (e.g. `=dropdown(array(1,2,3))`). The `dropdown` function has other optional arguments that can be found in the [function library](../function-library/index.md) to customize the behavior.

![dropdown](../../../assets/efbe15bb0c8b36d455a853b079e6982cb4ddf7d5d499c3eca1f2ccce8f419681.webp)

You can lock any set of cells in a shared spreadsheet to prevent accidental edits. Once locked, any user will need to remove the lock to be able to edit the cell again.

![cell\_locking](../../../assets/54cb78993ccea8961eff5cdbc11f1404c2ff19f5050972972f82ed1b6a996a41.webp)

The `url` function allows you to create links in any cell of the spreadsheet. You can use the `url_encode` and `query_params` functions to get help formatting a string for a complex URL.