Report using a script to calculate Subform data

Report using a script to calculate Subform data

Hi Experts,

I would have liked to be able to add a button to my form so that we can automatically add multiple entries to a subform but a search of the forum indicates it's not possible. Please tell me if I am wrong :-)
(Add a start date & number of weeks to the main form, press button and then it then adds an entry for each week [on a Monday] to the subform)

On the strong assumption that it's not possible I have a requirement to create a report showing bookings by week/month but that detail is not held. Only the Start date & how many weeks booked.
So if we imagine that we only have 2 bookings in the system:

Name:                    Mark
Start Date:             11 Dec 2017
No Of Weeks:        3

Name:                    Eric
Start Date:             04 Dec 2017
No Of Weeks:        2


A report by week would count each week's booking where applicable. Such as....


Date                                                                                                                No Of Students
27-Nov-17 0   
04-Dec-17 1
11-Dec-17 2
18-Dec-17 1
25-Dec-17 1
01-Jan-18 0


Is this even possible? I am new to Zoho so don't know much Deluge and can't even seem to add a report column via script; they just get ignored :-( 

Mark