Sheet2 is the Gematria converted to shifts. To create these shifts we use the Prime Counting Function ,Pi(p), on the prime numbers associated with each letter in the Gematria.
page_x is the xth page of the Liber Primus. There are 58 pages total, beginning with a count of 0 we have pages page_0 to page_57 (*) There are many "hidden" pages in the spreadsheet for organization, right click on the bottom and select "unhide" imgur.com/asLy62L (**) The visible pages are those that begin each distinct section of the Liber Primus. The current theory is that each section uses a different key, so these pages are the best to start.
The "Count" row denotes the index corresponding to the letter position on the page. The "Modifier" row is the Encryption Key - use this to try various key sequences. The Modifier (Key) is applied to the cipher text to obtain the "Decoded" row.
See page_56 and page_57 to see how these were decrypted. Page 56 uses the "Count" row to look up the index of the prime corresponding to Pi(count) and subtract it from 59, mod 29.