How to make a slotted assembly slide together?


When you add your mates, you can use advanced mates rather than standard mates.
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Step 1:
I started by selecting the right planes of your outer slot and middle slot.
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Step 2:
Under the advanced mates tab, select the distance icon (the number next to this is the current distance between the two planes). to get the freedom I think you are looking for I made the maximum value 3.5 and the minimum value -3.5.
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Step 3:
I then repeated the steps matting the right planes of the middle slot and the inner slot.
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Step 4:
I used the same values and after you click the green check you should be able to move your assembly the way you desire.