Need assistance in writing a apex trigger to add a list of standard lines to an object

Question

Newbie to salesforce and looking for a way to write a trigger that will create 11 line items for when a field is update. Object is credit request and when this is saved would like multiple credit lines to be added which is also an object. Below is a rough start, but looking for guidance. Picture attached showing what I would like to see after the request is saved and line items automatically created.

trigger TestCreditLinesAdd on Credit_Request__c(after insert){
List < Credit_Lines__c > creditlines = new List < Credit_Lines__c > ();
for (Credit_Request__c cr: trigger.new) {
    creditlines.add(new Credit_Lines__c(.Quantity__c = 0.001));
}
insert creditlines;}

Answer 1

Here are a couple of hints, showing how to check for a field value change and how to hook the child objects up to the parent object via the parent object Id:

for (Credit_Request__c cr: Trigger.new) {
    if (cr.FieldName__c != Trigger.oldMap.get(cr.Id).FieldName__c) {
        creditlines.add(new Credit_Lines__c(
                Credit_Request__c = cr.Id,
                Quantity__c = 0.001
                ));
        creditlines.add(new Credit_Lines__c(
                Credit_Request__c = cr.Id,
                Quantity__c = 0.002
                ));
        // Add others for a total of 11 child objects
    }
}