I receive daily vendor invoices with payment installments like below: 

1st parcel on the 32nd day - $40;

2nd parcel on the 45th day - $32;

3rd parcel on the 73rd day - $75,

and so forth. This happens quite often. I can't imagine how many Payment Terms options i'll have by the end of the year...! Not mentioning the time needed to create payment terms for each invoice.

Am i missing something? How can i make payment instalments for each situation without having to create a different payment term for each invoice?

The old ERP i used solved this problem very easily, (although it had lots of different problems.) just by selecting the amount of instalments and it created a new line for each instalment with due date, instalment value, and payment type.

Is something like this possible in Odoo?

Edit: If i could at least edit the credit column in the Invoice app, that would be great.