Records with nested tables

I want to implement filling fields with pulling other tables?

  1. id_item
  2. date
  3. number of items (1, 2, 3, etc.)

Depending on the number of items, the same number of tables with one field appears below, but with the ability to add their number by clicking on the “+” sign. For example, 2 items are indicated. 2 tables appear below.

Table with description of item #1

  1. id_describe
  2. id_item
  3. length
  4. width

If you click on “+” another line with fields will appear:

  1. id_describe
  2. id_item
  3. length
  4. width

Table with description of item #2

  1. id_describe
  2. id_item
  3. length
  4. width

If you click on “+” another line with fields will appear:

  1. id_describe
  2. id_item
  3. length
  4. width

How can you implement such functionality in the simplest way?

There is no such feature. But you may try Master/Detail-Add instead.

I know this option, but it does not solve my problem. I need to add and edit all data on one page, not on several.