Remember that a 1 in a TRIS setting will make the pin an INPUT (remember 1=I=Input), and a zero will make it an Output (remember 0=O=Output).

So, TRISE=$FF is the same as TRISE=%11111111 (all input)

and TRISE=$00 is the same as TRISE=%00000000 (all output)

so to make bits 0 thru 3 INPUT and bits 4 thru 7 OUTPUT you can write...

TRISE=$0F or TRISE=%00001111

and to make all even bits INPUT and all odd bits OUTPUT...

TRISE=$55 or TRISE=%01010101

and to make pin E.2 and E.7 INPUT, and all the rest OUTPUT...

TRISE=$84 or TRISE=%10000100

etc etc.