$col["width"] will set width of a column.

Refer documentation "Customizing Columns of Grid".

If you want to customize any specific column properties, and let other columns be displayed from table definition, you can pass 2nd argument of `set_columns($cols,true)` to `true`.

$col = array();
$col["name"] = "company";
$col["edittype"] = "textarea";
$col["width"] = "200";
$cols[] = $col;

$g->set_columns($cols,true);

custommizing columns of grid.

#1)
i am using the below code to display column title name as 2 lines, BUT
the column height is not adjusting to accomodate multiple lines within a column thus only first text of title displays.
#2)
how to adjust text display of column title names as 1 line on both ADD & EDIT forms
the spacing and formating of text column title names overlay field names.

any clue?

$col["title"] = "Contract<br> Type";

The code is correct, however it may be due to other css file conflict.
You can try disabling the external css files.

Another option is to modify conflicting css and check using firebug.