Sample: dhtmlxGrid Multiline cells dhtmlxGrid main page
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Sample demonstrates multiline cells in grid.
enableMultiline method makes all grid multiline. But you can set some rows/columns with fixed height (not as multiline) using custom code like in this sample. Cells in the third column is not multiline.

 
<style>
    .not_m_line{
        white-space:nowrap; overflow:hidden;
    }
</style>
<script>
 
    ...
    mygrid.enableMultiline(true)
    mygrid.init();
    mygrid.loadXML("grid.xml",function(){
        mygrid.forEachRow(function(id){
            mygrid.cells(id,2).cell.className='not_m_line';
        })
    });
</script>