I want to create polyline from the points seen in the list. point sequence must be
(0:0:0) point0;(0:0:1)point1;(0:0:2)point2;(0:0:3)point3;(0:0:4)point4...
create a list of numbers {0, 1, 2, 3...} using the series component. You should make one number for each sublist of points you have. Then you need to match every number with its corresponding list. This involves Grafting the numbers, so that the number of sublists in the number-data is the same as the number of sublists in the point-data.
Then extract the points using the ListItem component, flatten the result and you can make a polyline. Not as easy as you hoped is it?