Presumably you want to put the text in the cell and format it as bold? In which case
Code:
strtxt = "SomeText"
'set a range to the cell
Set rng = tbl.Cell(i, 3).Range
'remove the end of cell character from the range
rng.End = rng.End - 1
'Add the text to the range
rng.Text = strtxt
'Format the range
rng.Font.Bold = True