As of Jamf Pro 10.14, the Jamf Pro API (/uapi) allows access to create and update scopes for computer PreStage Enrollments. Edit the information at the top and include a list of computer serial numbers for the COMPLETE scope. (The script replaces the scope list; it doesn't update.) Be sure to leave the opening and closing parentheses.

Set Computer PreStage Scope.bash

#!/bin/bash

# server connection information
URL="https://talkingmoose.jamfcloud.com"
username="API-Editor"
password="P@55w0rd"

# provide the Jamf Pro ID of the PreStage Enrollment; look in the URL when viewing the PreStage Enrollment
prestageID="1"

# scope the following serial numbers to the PreStage Enrollment
serialNumberList=(C02QR0D0GFWM
C02X82E1LHD3
C02QHRD0GFWM
C02X8F1CLHD3)


# this function was sourced from https://stackoverflow.com/a/26809278
function json_array() {
  echo -n '['
  while [ $# -gt 0 ]; do
    x=${1//\\/\\\\}
    echo -n \"${x//\"/\\\"}\"
    [ $# -gt 1 ] && echo -n ', '
    shift
  done
  echo ']'
}

# created base64-encoded credentials
encodedCredentials=$( printf "$username:$password" | /usr/bin/iconv -t ISO-8859-1 | /usr/bin/base64 -i - )

# generate an auth token
authToken=$( /usr/bin/curl "$URL/uapi/auth/tokens" \
--silent \
--request POST \
--header "Authorization: Basic $encodedCredentials" )

# parse authToken for token, omit expiration
token=$( /usr/bin/awk -F \" '{ print $4 }' <<< "$authToken" | /usr/bin/xargs )

# get existing json for PreStage ID
prestageJson=$( /usr/bin/curl "$URL/uapi/v1/computer-prestages/$prestageID/scope" \
--silent \
--request GET \
--header "Authorization: Bearer $token" )

# parse prestage json for current versionLock number
versionLock=$( /usr/bin/awk '/\"versionLock\" : / { print $3 }' <<< "$prestageJson" )

# format serial number list for json
formattedSerialNumberList=$( json_array "${serialNumberList[@]}" )

# create json data for submission
jsonData="{
  \"serialNumbers\": $formattedSerialNumberList,
  \"versionLock\": $versionLock
}"

# submit new scope for PreStage ID
/usr/bin/curl "$URL/uapi/v1/computer-prestages/$prestageID/scope" \
--silent \
--request PUT \
--header "Authorization: Bearer $token" \
--header "Accept: application/json" \
--header "Content-Type: application/json" \
--data "$jsonData"

# expire the auth token
/usr/bin/curl "$URL/uapi/auth/invalidateToken" \
--silent \
--request POST \
--header "Authorization: Bearer $token"

exit 0

Thank you so much for your great code! Forked it to make machines move from one prestige enrolment to another.

And I forked yours to make it run from self service and move the current machine into a new prestage, values populated by script payload variables. Thanks my guy!