Split merged columns

is there any API to split merged columns for grid of suite 6?

You may try to use the removeSpan() method:
https://docs.dhtmlx.com/suite/grid__api__grid_removespan_method.html
Here you can find some instruction about the spans in the grid cells:
https://docs.dhtmlx.com/suite/grid__usage.html#addingremovingspans

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