covert 10bit ADC into 8 bit

hi all
i need one help from you(its simple,but i dont know)

how to convert 10bit ADC value into 8 bit adc value?( i am using pic24F)

for example, 16 word buffer mode

adc_vo = ADC1BUF0 + ADC1BUF1 + ADC1BUF2 + ADC1 BUF3 + ADC1BUF4 + ADC1BUF5 + ADC1BUF6 + ADC1BUF7 +
ADC1BUF8 + ADC1BUF9 + ADC1BUFA + ADC1 BUFB +
ADC1BUFC + ADC1BUFD + ADC1BUFE + ADC1 BUFF;

hi,
I am not familiar with the 24F series, does the ADC have the option to Left or Right justify the 10bit value from the adc.??

EDIT:
A quick look at the datasheet indicates FORM and FORM1 in the analog configuration up can be set to 'Fractional', if so just read the high byte register for a 8 bit conversion value.