How to create a custom variables? That I can re-use on templates / template mod / advertising?

[rdn]

How to create several custom variables that I can re-use on templates / template mod / advertising?
All those variables will just store NODE IDs.

Instead of manually adding this kind of conditional:
<xf:if is="in_array($__globals.forum.node_id,['1','2','3','4','5'])">
<xf:if is="!in_array($__globals.forum.node_id,['1','2','3','4','5'])">

I need to create some custom conditional out of it, like:
<xf:if is="$private_forums">
<xf:if is="$public_forums">
<xf:if...

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How to create a custom variables? That I can re-use on templates / template mod / advertising?

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