Hi everyone. I have a list with 10 items. each item is the position of a point in three coordinates X,Y,Z. I need to combine two subsequent points together and make them as a single item. e.i item 0 and 1 together. 2 and 3, 4 and 5 and so on. (see figure). any help would be appreciated. many thanks in advance!

Deconstruct your points so you actually have a list of lists of three numbers, rather than a list of points.

After that the problem becomes merging all adjacent list pairs. This can be done with a Path Mapper, but also with Split Tree, or Replace Paths probably.