> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getoneprofile.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Field columns
> The plain columns you fill in yourself, and what happens to your values when you change a column's type.
A field column holds whatever you type or paste into it. Pick its type when you add it, and change that type again later.
## Pick a type
The picker lists the everyday value types first, then a line, then the types whose value is one choice from a set.
* **Text**, **Paragraph**, **Number**, **Currency**, **Date**, **URL**, **Email**, **Image from URL**
* **Checkbox**, **Select**, **Multi-select**, **Assigned to**
## Change a column's type
Open the column's header menu and choose a new type from the list.
A value the new type can still hold stays as it is. One it cannot hold, like text switched to Number, goes blank instead.
## Good to know
They still exist. A column arriving from an import or an API can be one of them, and it displays and edits normally. The picker leaves them out of a column you build by hand, since Currency already covers the everyday decimal case.
It only survives a change that keeps the same kind of value. Switching to a different kind, like Text to Number, clears the default so an old value never renders wrong on every empty cell.
No. A column's kind is fixed once it exists. Add a new formula or enrichment column instead, and delete this one if you no longer need it.
Every plain type except Multi-select, Assigned to and Image from URL. Multi-select's value is a list, not one item; Assigned to is an identity nobody should default; Image from URL has no picture to default to.
## Next steps
Open the catalog and create any kind of column.
Point one column at another so it reads its value.