UM22.04 Inkscape 1.2 (1:1.2.1+202207142221+cd75a1ee6d)

OK working on dashed lines to create a break line on screenshot.

Created manual one using draw bezier duplicate and snap on grid and path combine to create the line. Now trying to start to just duplicate the one I have using Stroke Dashed Line and then later on to create different lines using knowledge acquired. Dashes are 6px wide by 40px long with 40 px spacing.

Basically the line extends past the screenshot and is cropped out. Longer line allows for different size screenshots using just one line.

Attached file includes the path and screenshot of dark area with the long lines cropped out.

I looked at the svg I'm struggling to understand...  Are you trying to create a custom dash style?

Dashed lines in SVG are not completely intuitive.

Draw a straight line with just two nodes. Open the Fill and Stroke dialog [shift+ctrl+f] and go to the Stroke Style tab. Set [Width: 6 px] to match your "Line A". Select [Dashes: Custom] and set [Pattern: 6.666 6.666].

The pattern represents length of dashes and spaces as a multiple of line widths. This means changing the line width adjusts the pattern proportionately. In your case the line width is 6 pixels so the dashes and spaces will both be 40 pixels. (There's a slight round-off error; 6.666 × 6 pixels = 39.996 pixels).

@TylerDurden not really sure of terms but I am trying to figure settings to take the line A and change it to be the same as line B and following insite from Paddy_CAD now see why I am failing. I manually created line B which has 40 px segments in a fixed length and now so for instance if I want line B to have 30 px segments in same lenth line to create a dashed line for svg in my screen capture program to visualize how it looks. Sorry didn't explain clearly.

@Paddy_CAD much clearer now, took a bit to comprehend for me. Missed the line width. Checking it works fine the way I was doing it if I set 1 px as width but already had 6 px as in your explanation. Also tried and verified with multiple lengths. Does seem like it accepts the pattern even if only one 6.666 is entered. Thus new information for my Inkscape Calc sheet. Length of Segment / Width Of Segment = Pattern (40/6=6.666 30/6=5 and so on). Have used the dashed lines before (not looking for exact dimension) and only trouble I had was entering another line and remembering the pattern I chose for the previous line.

Edit: Sorry got sidetracked and forgot to thank both of you.