How to Merge cell?

is there anything method/function to set/calling , to make some cells on spreadsheet to be merge ? any help would be appreciated thanks

Unfortunately there is no functionality in the dhx.Spreadsheet allowing to merge the cells.

tnx @sematik but it it possible to edit the library script ?

Such possiblity will appear in the future updates.
When there will be a public access to the grid object of the spreadsheet