How do I take room from one room to add closet space for my honey?

You need to construct a Partition that is Structurally Stable in the Room you want to Downsize for Storage before you start Cutting out Studs to place a Doorway.

By no means will this Wall to Wall partition cost less than $322. When it is not Wall to Wall, the Cost of the Partition can be more or less, but accessorizing the Gaps and Voids will indeed Cost you more.

In length...

Most people do this expanse at the same time they plan either:

I. To install a Laundry Room off of the Master. Why?

A. The Closet not being wall to wall, properly Dimensioned enables a place to put The stacking Washer/Dryer and the Ironing Board.

B. It is easier to reduce a Realized Budget as $2200 for 2 Improvements (including the washer and dryer) rather than $780 for dissatisfaction with 1 that needs to accessorize in all sorts of ways beyond $380 for a Reduced Satisfaction Guaranteed.

Or...

Ii. Garden Shed or Gondola. Why?

A. It saves a lot of hassles to just buy 2 Sheds and have the extra Roof and Siding for Repairs and/or any Expanse of the Outdoor Shed.

B. Often getting 1 DIY Shed Kit supplies you an Idea of the exact materials dimensions, hardwares and assembly cost and time, enough to keep the project cost in perspective.

C. Plus any Woodwork of the Indoor Design you cannot duplicate perfectly can swap out and go on the shed outdoors rather than on the closet indoors...

D. When you construct two storage areas the same, it is a matter of Conformity and Familiarity where: You know exactly what size boxes and containers will fit into either as both are exactly or nearly the same.

E. If you don't, you risk saying after it is all done: 'For the Amount I spent in Blades, Saws, Time, Labor, Effort on Designs, and Resource Waste, I would have been better off to install Drywall and Outlets over a Shed I Modify Slightly for construction Indoors plus save the Extra Siding and Roofing for Outdoor Usage and Repairs'