I want to create this kind of table with 3 large columns and at one point the column is divided to two smaller columns. Please note that the column not divided in the whole space.

**How can create the table with custom column sizes inside the larger columns?**

```
|------------------------------------------------------------|
|                |          A          |       Most Mon      |
-------------------------------------------------------------|
|  Methods       | Time [s] | RunCount | Time [s] | RunCount |
|----------------|---------------------|---------------------|
|    C           |          |          |    4     |    1     |
|    D           |          |          |    5     |    2     |
|    E           |          |          |    6     |    3     |
-------------------------------------------------------------|

```