A family of Microsoft word processing software products for creating web, email, and print documents.
Hello
Thanks for reaching out.
And I'll be happy to help you out today.
supposed you entered all your references manually and citation. You may use these keyboard shortcut to manually also input corresponding numbers.
For superscript, simply press Ctrl + Shift + + (press and hold Ctrl and Shift, then press +). For subscript, press CTRL + = (press and hold Ctrl, then press =). Pressing the respective shortcut again will get you back to normal text.
If you have more than same citation number use CTRL + h to replace all.
But if you want all to be automatically, You may refer to this link;
https://support.office.com/en-us/article/add-ci...
In there, You can choose ISO 690 to change citation into numbers.
If you have more concerns feel free reply.
Have a nice day !
-Regards,
Marj :)