What am I missing here? Trying to measure between interior walls.

[Timeless_16]

In the image below, I just started a full design, however, I am trying to measure between the exterior wall and the interior wall to make beams in Sketchup so I can import them in to make an arched timber frame interior. I keep trying the measuring tools but I can't get them to line up so the measurement is off I think. 

Also is there a way to put a marker, like a colored dot or x where you want an object or piece placed so you can measure from that object or snap to it?

Thanks.

[solver]

4 minutes ago, Timeless_16 said:

I am trying to measure between the exterior wall and the interior wall

 

I looks like you have done that on the left side.

 

Have you reviewed your dimension defaults and docs on dimensioning?

 

6 minutes ago, Timeless_16 said:

lso is there a way to put a marker

 

Like a Point?

[Timeless_16]

I did do that but I tried a test beam and it seemed off. I am wondering if I got it on the wall or more through the wall. 

I did look through it, I must be in the wrong section, there are two different guides and I'll take a look at those again.

Yes, a point.

[solver]

An Interior Dimension should give you what you need.

 

16 minutes ago, Timeless_16 said:

Yes, a point.

 

Place Point