as you mentioned OOTB field, I recommend you just to re-labeled it, you can do it under the [sys_documentation] table:
https://your-instance.service-now.com/now/nav/ui/classic/params/target/sys_documentation_list.do
If your new fields are created in some position that you would like to change, please use the Form Design or Form Layout depending on your preferences.
Go to the form where is your field(s) > Click the three lines > Configure > Form Design or Form Layout
Form Design:
- you can create the fields, add existing, change their labels,
- you can add sections/lists and add one or two columns,
- then you drag and drop as you wish:
Form Layout:
- you can create new fields, it is faster but maybe less easy if you will create more than one or two fields,
In both options you can play with the fields order and you can also create different view for different audience, for example Service Desk people might need to see different fields than Managers so you can create a tailored view for each or just to have one...
Find there your field and change the label - be careful such a modification might not get to your update set (check if yes or not) eventually you would need to export it via XML and that is better to do after EOB...
