Multi Select · Documentazione

A Multi Select column stores any number of choices from one list. Each option has a label and a color, and each chosen option shows as a colored tag.

When to use it#

Use Multi Select for tags: Skills, Allergens, Sales Channels, or Labels. A record can carry as many as apply.

Pick a different type when:

Only one choice is valid: use Single Select.
Each choice is a record with its own details, such as a customer, a part, or a project: use a Relation with Allow multiple records on.
The choices are members of your organization: use Person.

Setting	What it does
Options	The choices people can pick from. Give each one a label and a color, and drag them into the order you want. You need at least one option to create the column.
Standard list	Instead of typing your own options, use Currency codes (ISO 4217) or Countries (ISO 3166). The choices stay up to date. Switch back to My own options to edit them.
Selection Limits	The minimum and maximum number of options a record can have. Leave both blank for no limits. A minimum makes picking at least that many options required.
Allow Other Values	Lets people enter a value that isn't in the list.

Selection Limits and Allow Other Values are under Show advanced options when you create the column, and in Edit property afterwards.

Set a maximum when the business has one, such as "up to 3 focus areas".
If people keep asking for more details about a tag (who owns it, when it applies), it is time to turn the tags into their own table and link to it with a Relation.
A Multi Select can be converted to Single Select, and a Single Select or Text column can be converted to Multi Select. See Change a column's type.