Use AWK to display x-th and y-th lines after a regex match

In a script you might be interested to keep 2 or more lines after a regex match ,
the line that interest you are not always going to be right after the match ,
the first one might be X lines after the match and the second one Y lines afters the match

<item desc>
<name>
<brand>
<weight>
<price> 
<location>
<stock></stock></location></price></weight></brand></name></item>

in this example , i’m interested in keeping the lines with the price and the number in stock
i’m going to use awk to search for item desc , and display the 4th line after the match, and 6th line.

awk '/item desc/{nr[NR+4]; nr[NR+6]}; NR in nr' filename