I need that when a cell says true or false certain rows and/or columns are hide/unhide. Let me explain:

If U70= FALSE rows 72-439, 3-4, 39-40 and columns L-S are all hidden
and
rows 1-2, 41-71 are all showing (Unhidden)

BUT, if U70= TRUE and cell B74 is BLANK... rules when false (bolded area above) still apply, but in addition, row 72 is now also showing (unhidden)

BUT, if U70= TRUE and cell B74 if FILLED... rows 1-2, 41-72, 440-4509 are ALL HIDDEN
and
rows 3-4, 39-40, 74, 439 and columns L-S ARE ALL SHOWING (UNHIDDEN).. ALSO, ROWS 75-438 IS UNHIDDEN AS THAT ROWS B COLUMN IS FILLED.

If someone could help me with this... IT WOULD MORE THAN GREATLY APPRECIATED... THANK YOU in advance to EVERYONE who decides to help me!!!