Charles' suggestion will remove page numbers from all TOC levels.

If you want to not show page numbers on TOC1 only then you should edit the field code directly. To do this, Select the entire TOC and press Shift-F9 to show its field code. It should look something like the following couple of examples
{TOC \o "1-3" \h}
{TOC \t "Heading 1,1,Heading 2,2,Heading 3,3" \h \z}

To remove the page numbers for just the TOC1 paragraphs you need to include a switch which looks like
\n "1-1"

So in the first couple of examples the code would change to
{TOC \o "1-3" \n "1-1" \h}
{TOC \t "Heading 1,1,Heading 2,2,Heading 3,3" \n "1-1" \h \z}

Once you've done this, press F9 to update the field.

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Andrew Lockton
Chrysalis Design, Melbourne Australia