problems with changing prices for group of products

Hello,
There are four manufacturers in my shop. Two are from Poland, two from Germany. Is there a possibility that I give for the German manufacturers prices in euros, for Polish ones in polish currency (zloty) and in future make all changes with prices by manipulating the euro exchange rate?? I want to have all prices in shop in zloty.

If there is no such possibility, maybe there is some different possibility to make a one-time increase in all prices for the selected manufacturer. In my case each manufacturer has about 300 products, so changing prices in shop (due to todays variable exchange rate) is difficult...

Zencart 1.37 PL

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Find the free version of Easy Populate (EP) in the Free Software Add Ons section (link, top-left). Download a simple CSV file using EP which includes your prices (only needed the first time.) In Excel or similar software, sort the file so all the Euro prices are together. Apply a conversion factor to those prices. Upload the modified file, again using EP.

Once you get used to doing it, this should take you only a minute or so each day.

Rob