does this help.

Change the space between paragraphs

1. Select the text you want to change.
2. On the Format menu, click Paragraph, and then click the Indents and Spacing tab.
3. Under Line spacing, do either of the following:
* In the Before paragraphs box, type or select the amount of spacing you want above the paragraph.
* In the After paragraphs box, type or select the amount of spacing you want below the paragraph.

Tip The default value for space before or after paragraphs is displayed in points. You can specify other measurement units by typing the abbreviation for them after the numerical value: inches (in), centimeters (cm), picas (pi), points (pt), or pixels (px). When you specify a unit other than points, Microsoft Office Publisher converts the measurement to points.
Set automatic spacing between lines of text

1. Select the text you want to change.
2. On the Format menu, click Paragraph, and then click the Indents and Spacing tab.
3. Under Line spacing, in the Between lines box, type or select the amount of spacing you want between lines of text. For example, to double space type or select 2sp. To change from double space to single space type or select 1sp.

Tip The default value for space between lines is displayed in spaces (sp). If you type a whole number, Publisher interprets it as a number of spaces. You can specify other measurement units by typing the abbreviation for them after the numerical value: inches (in), centimeters (cm), picas (pi), points (pt), or pixels (px). When you specify a unit other than spaces, Publisher converts the measurement to points.

Having trouble with line spacing in Publisher 2010...

I know how to change the line spacing, the default is 1.19sp and I would like it to be 1sp in my document. Every time I change it, hit OK, go back to the document, it automatically changes it back to 1.19sp. Has anyone had this problem? This is so aggravating, I just want to the line spacing to stay at 1sp!