calc

I am looking for any recommendations on accurate and customizable sales forecasting formulas. There are the obvious choices of using Excel/LibreOffice forecast function, or even just averaging time-periods then guessing whether that trend will either maintain, decline, or improve and adjusting...

Hey, I work with huge data sets, often 100,000 rows plus. How can I get past the 10,000 row import limit? I import Tab Seperated sheets, and sort 100,000 rows into 10 sets of 10,000 is the ache in my balls right now! I work with Open Office Calc. I know this is probably a absolute nub...