In a assembly there must be a two grade of DIN 6921 screw.
If I'm understanding your question correctly you would like to apply a certain grade of fastener and have both options available in the tool box.
You can do this with a custom property as shown below.
Add the custom property, "Fastener Grade" or something like that. Add the grades of fasteners you want and enable the custom properties. See the first picture.
Now when you place a fastener from the ToolBox that grade will show up as a pull down option when you place it. You can also add an additional field that can be called in your BOM so that it shows what grade of fastener you called out. We added a secondary description that is essentially a "Laymen's" description of the fastener. It does not show the ISO/DIN etc call out because purchasing had no idea what any of that was. It shows the Screw size, thread pitch, length and plating. It also shows specifically if it is a "Full thread" or "Fine thread"
Thank a lot.
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