Reading the data sheet of my 16F88, I can't find the way how to enable pull-ups on PORTB one by one.

I don't understand what "latch" means (in french, latch is translated as a kind of lock)?

Bit 7 of OPTION_REG sais: "PORTB pull-ups are enabled by individual port latch values".

Does it that mean you have to enable the pull-ups for all PORTBs and then, if you'd like to disable it for one or another port, to set this port as an output?

There are no pull-ups for PORTA. Is this correct?