In drawing Characteristic lines or linetypes are important because they have technical implications, for example, a dashed line means the piece is invisible. or hidden inside, etc. AutoCAD has commands to help in this case as well. That is the Linetype command in the Properties tool group as shown in Figure1.

Normally, AutoCAD sets the default linetype for each layer to be a continuous line. Therefore, every work piece will be automatically generated with a continuous line. No settings are required. But if wanting to create or switch to another line format, such as a dashed line, there must be a procedure for selecting a line to use as follows:
Start by selecting the Linetype option and then selecting Other..

After that, the program will show the Linetype Manager window, it will find that there is a list of currently selected lines. If there is no line you want, click Load to select more, as shown in Figure2.

After that, the program will display the Load or Reload Linetypes window, select the desired line from the Available Linetypes list as shown in Figure 3.

After finishing this step, we will have the selected Linetype in the list. I chose Dashed so it appears in the list as shown in Figure4.

Let’s take a look at the steps for implementing Linetype.
Assuming that you have created 2 pieces and want to change the circle to be a dotted line. Click to select the circle, there will be a window showing the properties of the workpiece (properties) as shown in Figure5.

Then click to select Linetype and a list will be displayed as shown in Figure 6.

Choose the line that has been loaded, for example, I choose the dashed line (Dashed), the circle piece will change to the dashed line as needed.

It’s not difficult, try it. After this, I will expand on Linetype Scale. Don’t forget to follow.
