Truncating alignments in a SAM/BAM file

Hi everyone,

I am interested in narrowing or truncating the alignment of reads in SAM or BAM formatted files by X NTs from each end. My reason is
that the detection of indels is a bit muddied by a percentage of reads reaching into or across indels which may be poor alignments even after quality aligned reads trimming and removing clipped reads.

Any suggestions would be appreciated.

Thanks!
John