How do I put both lines on my account under one Apple ID?

[Gadriver]

How do I make sure both lines on my account are under my Apple ID? My 2nd line is my husband's phone and I want to share the Apple ID with him and then each have our own iCloud account.

[MiiHere]

I don't believe that is possible. You can only be logged into one Apple ID at a time and if you want to share text messages and phone calls and cloud, you'd just use the same Apple ID across the board.

[mama23dogs]

Gadriver

I Think what you are looking for is:

You should each use your own Apple ID in your phones, (but it is possible to have one Apple ID on multiple devices. )

IF you want to share purchases, that's easy.  Apple started the Family Share option with iOS 7 that allows you to purchase apps on one account, but everyone in the family share group can use them.

iCloud - Family Sharing - Apple

YOu will note it can be set up with or without approval, for children. 

[smith6612]

Not recommended to share Apple IDs across phones. Things start to get messy really quick. Best to use Family Sharing as advised above to share purchases.

[Ledsteplin]

You can share the same iTunes ID. But iCloud, iMessage and Facetime ID's should be your own. Otherwise, you run into problems.