Hi Zakria,
Ok, I better understand your use case now. There are other fairly simple ways you can do it today, without using any sort of "append" functionality. Here are a couple that come to mind:
1. Based on your monthly data, you can create a metrics, e.g. "Server Count", and assign "1" to every server (you can also create metrics like "Server Cost" and "Server Quantity" and assign the relevant values there). Then, on the reporting layer, you can create reports that do month-over-month comparisons based on those metrics. I don't know what other comparisons you want to do, but it should work for the examples you provided.
2. Lets say your original table is called "Servers". You can create another table and call it something like "Servers - Prior Month".
Then when you load, e.g., the July file into the "Servers" table, you'll also load the same exact file into the August "Servers - Prior Month" table.
Then, come August, you'll load the August file into the August "Servers" table.
You can now do a lookup on whatever comparison/validation/information you need between the two, and you essentially have a comparison between current month and prior month.
Let me know if any of these will work for you, or if your use case is different then my understanding.
Thanks,
Guy