[NEED HELP] Add sides to Bevel?

I have an 8 sided bevel I want to use to cap off a quarter-cylinder with 14 sides for its curve.
The bevel needs to be 14 sided otherwise there will be a noticeable seam.

I only managed to add columns and try to align the points to the quarter cylinder, but the bevel is still 8 sided...

I clicked around the curves menu, but I don't see anything that leads to adding sides to the bevel.

I'm not sure of what type of cap are you trying to do.

 
Something like this?

Or is it like this?

For simplicity's sake, when making bevels you should always stick to squares with even x/y lenght. The oddity in lenght is rarely worth the trouble. I'm assuming you want something like this: 1 - 2, right?

Ups... sorry. Some explanations:

First screenshot: It is a cap made with "Cap Selection". Then I have inserted and added ROWS.

Second screenshoot: It is a simple Patch Mesh of 3x3. Then I have inserted and added ROWS.

You can also move vertexes on a simple patch mesh like this: https://i.imgur.com/7qe8ANt.png

Simplest way to add sides to non 3x3 bevel is to use 'thicken'

@Julius
I wish it was that simple because that was one of the things I've tried. As far as I can tell, it gets its subdivisions by the size of the brush. Or something unexplained.

It looks like I can get more subdivisions from tinkering with the patch like like Smilecythe suggested.

@Antares: It could be helpful to see more of your scene. Else why don't you make the wall below also an endcap/bevel. This way you get both textures and no holes in your wall.

That's because majority of the map was not built in NetRadiant and instead was imported. I initially left a hole in thinking capping wouldn't be hard to do in Radiant. I later resorted to importing a cap that fits better though it still means not being able to properly use NetRadiant for what it is.

Curves have LoD fyi, so only curve+curve junction might be guaranteed to be seamless

I assume the seams would be gone if the vertices were aligned with the existing bevels like I did in the first image (that's with adding columns); I guess it doesn't work that way.

Green points: Look at them as if they were vertices.
Pink points: Look at them as if they were special "control points" to create curves between adjacent Green points.



And if you want Netradiant to show patches more accurately, go to Preferences => Patches => Patch Subdivide Threshold
I have it set to 2.