You can place your walls in exact positions using dimensions.
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Tools & Techniques
276 - Using the Space Planner
5487 - Drawing and Placing Objects
252 - Centering Objects
302 - Multiple Copy
303 - Using the Break Tool
254 - Using Construction Lines
5429 - Positioning and Resizing Objects Using Dimensions
2432 - Adding Watermarks
304 - Merging Polylines that Overlap
305 - Subtracting Polylines that Overlap
306 - Using the Trim and Extend Commands
267 - Using the Point to Point Move tool
5307 - Using the Object Eyedropper and Painter
247 - Using Style Palettes
10197 - Productivity Tips
1598 - Using the Library Painter
193 - Offsetting the Reference Display
37 - Color Chooser
264 - Displaying Coordinate Axes
925 - Stretch Zones and Planes
5413 - Edit Behaviors
10096 - Designing and Selling with 3D Software
5225 - Importing and Managing PDF and Picture Files
61 - Controlling the Drawing Order of Objects
1924 - Using Macros in Object Labels
Dimensions
5488 - Dimensioning Basics
5426 - Creating Automatic Exterior Dimensions
506 - Dimensioning Kitchens, Baths, & Other Rooms Using Auto Room Dimensions
5430 - Using the Manual Dimension Tools
274 - Creating Dimensions in 3D
5432 - Editing Dimensions and Extension Lines
128 - Dimensioning Wall Elevations
127 - Dimensioning Cross Sections & Elevations
1595 - Dimensioning Cabinet Face Items and Openings
92 - Using The Automatic Interior and Automatic NKBA Dimension Tools in X13 and Prior