Thank you. I've seen the api help before, but still have some questions. I want to call the function of toolbox by using the vb.net language, such as build a standard gear. However, I don't know how to write vb.net codes to realize it. So, if there has an example about it, it will help me a lot.
I don't think you can do that with API. But you do not really need to. You can do it with the Toolbox Settings. Click on down arrow and create configuration/parts based on your setting to use configurations or parts for the different sizes.
Not knowing what you want to do with toolbox, start by looking at this.
http://help.solidworks.com/2018/english/api/SWHelp_List.html?id=d0c2cae3b7be457db3a7a5eb35a12424#Pg0