In order to create a new custom field for orders, go to Administration -> Custom fields and click on New custom field in the right upper corner. You will have to choose the type of object for it first.
Next, fill in some details.
![order lines new custom field.png](/cms/assets/thumbnail/46660/700/order%20lines%20new%20custom%20field.png?token=6085dd8eacacb9fd4d09f68de8cbd198c4fb284cbc29c0c2cf42e9fd4d8d42f6)
You can also edit existing custom fields - just click on the name of the field.
After you use custom fields in your product, it should look like the below:
![order line custom field.png](/cms/assets/thumbnail/46659/700/order%20line%20custom%20field.png?token=8942ef034a1459810a24708bd515224909c45ee8ab90d1a736eae9a998d8459c)
If you want to filter data based on your new custom field, just check this option in. You can also decide whether this custom field will be a required field, available for all projects or just some of them, available for certain trackers and whether it will be a private custom field or visible for other users.
Custom fields are usually used for filtering data - they are available in the filters dropdown list. To see the custom field in the list of filters you need to edit this field and enable the Used as a filter option.