Hi @Star, Post and Offset are very similar functions, however, they are going to give you very different results. Offset is going to give you the value from your selected line item x number of periods in the future or in the past. For example, in your line item Confirmed PO Delivery, week 6 is looking back 1 period (Final Shipping Time Weeks = -1) and resulting in your value of 1 since there is a 1 value in Confirmed PO Delivery in week 5. Post, on the other hand, is going to push the value from your selected line item x number of periods in the future or in the past. For example, in your module, the 1 value in week 5 in your Confirmed PO Delivery line is being pushed 2 periods into the future because that is value in your second argument in your function (Final Shipping Time Weeks = 2). This function also allows you to sum values if they point to the same period. For example, if you also had a 1 in the Confirmed PO Delivery line item for week 6 it would be pushed forward 1 week into your week 7 and combine with your 1 value from week 5 to give you a value of 2 in week 7. Offset will not let you combine values in the same way.
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