equation
How to create a cross-reference to an equation in Word - Microsoft Word 365
https://www.officetooltips.com/word_365/tips/how_to_create_a_cross-reference_to_an_equation_in_word.html
How to create captions for equations - Microsoft Word 365
https://www.officetooltips.com/word_365/tips/how_to_create_captions_for_equations.html
Microsoft Word - How to add equation numbers and refering to them in Word.docx
https://benediktheid.weebly.com/uploads/5/8/3/9/58395491/how_to_add_equation_numbers_and_refering_to_them_in_word.pdf