YII2 table input with dynamic number of columns, how?

Question

MySQL

Good day!
There is such database:
Essence in the following
Complexity with filling of the table 'budget'. As a result, I want to get the following form:

project_id - id of the selected project, in which we fill in the budget
costitem_id - a list that is associated with the project through the projectcostitem table
period - the name of the month, the first "MONTH(start_date)" and so on until "MONTH(end_date)"
budget - in fact, the budget for the respective month
How can this be done?

Answer 1

For example, you can try to implement using the relationship declaration