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Hi
To only add a line between paragraphs or the contents, you can insert it from the shapes and after that change its formatting like (weight, color, shadows, ...etc) from the format tab.
To add a border around text
Home menu option > Paragraph group > Boarders > Outside boarder
for Table, click anywhere in table
Design menu > Boarders group > Boarder > Outside Boarders
Without knowing what exactly mean by line border, In MS Office Applications, you can create standard and custom borders from Home>Paragraph tab in Ribbon.
