To draw a line parallel to the given line through a point outside the given line using set - square:

• Method I: Steps of the construction

1. Draw line `l`. 
2. Take a point P outside the line `l`. 
3. As shown in the figure, place two sets-squares touching each other. Hold set - squares A and B. One edge of set-square A is close to point P. Draw a line along the edge of B.
4. Name the line as `m`.
5. Line `m` is parallel to line `l`.

• Method II: Steps of construction 

1. Draw line `l`. Take a point P outside the line.
2. Draw a seg PM ⊥ line `l`.
3.  Take another point N on line `l`.
4. Draw seg NQ ⊥ line `l`. such that `l("NQ") = l("MP")`.
5. The line `m` passing through points P and Q is parallel to line `l`.