custom code snippets in intellisense

If you are still not seeing the shortcut, but you have ReSharper then check in Resharper > Options > IntelliSense > General. If you have ReSharper radio button selected, then your intellisense created in VS [shortcut] will not appear. Change that to Visual Studio or alternatively create intellisense in ReSharper

You need to set the ShortCut property like <Shortcut>slpropdp</Shortcut>. The best way to learn editing this, just check any of the already existing codesnippets. By, going to Tools -> Code snippet manager. Select any code snippet, the location of the code snippet will be available at the top location bar