If all the graphics in your document need the added space, dedicate a paragraph format to anchoring graphics, and include the extra space in its definition. If you need to add space to only one or a few graphics, use the Graphic ID; see §32.4.1 Assigning properties to sets of graphics.
To add space using the paragraph containing the anchor (for example, GraphAnchor):
[HTMLParaStyles] GraphAnchor = CodeBefore
[ParaStyleCodeBefore] GraphAnchor = <br>
This method adds space for every graphic whose frame is anchored in a GraphAnchor paragraph.