It's pretty simple
Make a excel file, click on "Data" -> From web -> Insert
http://altexplorer.net/address/ (your wallet address here) and select block that shows transaction and balance (you need to click on small yellow arrow icon on left side.) and then click on import.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FGD3DZ8b.jpg&t=665&c=srHN8ts2inqpPA)
Do this with all your altcoin address and collect all data on same page, for eg:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FYJZ0Aen.jpg&t=665&c=TRTM6uEl4qAIlw)
Then right click on each block and click on "Data Rage Properties" and check "Refresh data when opening the file" option.
Once you add your all wallets data, open Sheet 2 and make a small summary.
For example:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FrL1o9DE.png&t=665&c=1cWvq0UXaabF8g)
To grab balance from previously created data click type = and select first cell that shows balance. Eg: 14.2125 COYE
You can then add a total count if you want or you can also grab current prices from various exchange sites and calculate total value of your coins in USD/BTC
Ps: I didn't tested this but I think when any new transaction will come into any address, that last balance transaction will get replaced by new one.