Hi dt,
Thank you for your interest in Syncfusion products.
Yes, Essential PDF supports Columns Span feature. Column spanning is supported in our "New Table Model". Our New table model has many new features like column overflow, autofit, cell merge, column repeat, exact table position when the table spans multiple pages, etc. This is available in "Syncfusion.Pdf.Preview" namespace. Please take a look at the following new table model sample which demonstrates the various features.
http://www.syncfusion.com/Support/user/uploads/TableFeatures_f466034a.zipHere is the sample program where the column text spans for more than a page.
http://websamples.syncfusion.com/samples/PDF.Windows/F-61844/main.htmHere is the generated PDF document for your reference.
http://www.syncfusion.com/Support/user/uploads/Column_Span_457c39ff.zipPlease let me know if you need further help.
Regards,
Sarath