"save as above" option in the form?

[runnoob]

Matrix Version:5.5.6.10
I have a form that needs to fill out personal info:
Name/Email/Phone/Address

Then I want to make a billing info with “same as above” checkbox at the beginning.
If it’s checked then all the billing info will not need to be filled.
How to make it work?

[hmcmaster]

In general, you will need to use JavaScript or jQuery for this.