using picc on a pic1f627

First, I am retired and doing all this just for fun ;-) and it's a looong time since I used C language

I need to write 4 bits to PORTB without disturbing the others bit
RB1, RB2 are ( will be ) used by the UART.
If I Mask 4 bits like CC = CC & 0x0F the upper bits are set to 0 but still there?

I think I could create a structure ( or a type ) with 4 bits such as
BCD { RB3
RB4
RB5
RB6
}

But I keep trying, no luck ( so far )
Can someone give a hand??
Many thanks in advances
André
.

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