question

The answer that works best for you may depend a little on how you want the parts to arrive. for example, if you want Parts A and B to occur randomly, or if you want a Lot of Part A and then a separate Lot of part B, etc. Based on having a Schedule Source in your model, I'm guessing that you want a batch of "Part A" tokens to be created at one time in the model and a batch of "Part B" to be created at another time. So I would set up my Schedule Source Like this:

I added a second row to your schedule, the time field could be whatever time you want, but as currently put together now you would get all your first row arrivals first and the second row arrivals right after in the sample moment in time. If you wanted you could also name the Parts Part A and Part B int he name field but it isn't required.

Notice in the red rectangle I have created a label with the same label name that you had in the "Assign Labels..." section, I moved the label declaration there because I was assuming that you want all the Parts from row 1 to be the same type. I'm also using simpole numeric values fro the type ( 1 and 2) because values are usually easier to work with. For example if you wanted to set either the product shape or color (or both) based on what kind of part it is, it's a little more straight forward with numbers rather than working with text or names like "Part A":

Here's how you can have different parts have different 3D shapes using the Create Object activity (Note the use of your labelItem label to choose between box and Cylinder shapes):

And also here with changing the color using a Change Visual Activity:

Also notice the 'Product' label. You had 'labelItem' declared on the create object activity and the source, which means the value from the Source would have been overwritten by create object. I renamed it Product because the purpose of the label is to give youy a reference to the object that was created, rather than storing a value.

See your model below:

testmodel.fsm