Hi Gigi, hi folks.
Sorry for the text being cut off. I made that tutorial on an 19 inches monitor and, if viewed on anything smaller, it may produce that result. Simply zoom out to get the whole picture. You may also pan if required.
This tutorial is simply a SKP model using Scenes. Use the Scenes tab on top of the model window one by one and in numerical order in order to follow the development of the modeling.
When you have an inference that suits you, remember to press and hold the SHIFT key to lock it. While still maintaining the SHIFT key down you can continue with the drawing operation (line drawing for example).
For a parallel line, you use these steps:
1 - Find the starting point with the inference from the center of a circle.
2 - Click on the center to start the line.
3 - Place the cursor over a line that you would like to be parallel to. Wait for the pop-up stating "On edge".
4 - Place the cursor in such a way that you get a line attached to the staring point already defined and in a direction roughly parallel to the line inferenced at step 3. Wait for the magenta inference and the pop-up.
5 - Press and hold the SHIFT key to lock the inference.
6 - Move the cursor along the required direction and for the required length. Use the VCB, if required to specify the exact length.
7 - Click to set the end of the line.
8 - Release the SHIFT key.
Just ideas.