how best consolidate scripts?

the proceed customarily consolidate book "source"

eg:

main.sh:

#!/bin/bash

source incl.sh

echo "the sure script"

incl.sh:

echo "the enclosed script"

the cost executing "./main.sh" is:

the enclosed script
the sure script

... now, try govern bombard book another location, can't consolidate unless it's your path.

what's good proceed pledge your book consolidate script, generally instance, book needs portable?