Trim arc line with two lines and removing trimed segment

[glugwort]

How do i trim out ( Remove ) part B, with lines A ?
leaving the remaining Arc’s at C

[malo_m]

Hi Glugwort,

find the intersection points between curve A and arc C,
use the resulting curve t parameter and the shatter component to split the arc.

[Adam_M (Adam Mounsey)]

If the curves in the centre already form a closed region, you could also use this approach.

[glugwort]

Thanks to you all for your help.

I can advance onto my next stumbling block.