Hello all I am new to speedrunning and I have currently been running a l4d1 all campaigns route and was wondering if a category could be added for it as I would like to submit a run

There's already a category for that. Go to https://www.speedrun.com/L4D?h=All_Campaigns_Solo&x=xd1my8rd

Bonzi I’d imagine because the campaigns were updated when put on left 4 dead 2 that they wouldn’t be valid for left 4 dead 1 campaigns in left 4 dead 1 because they are different games, if I lm wrong please let me know because I’d love too also

If people want an "All L4D1 campaigns on L4D2" (or "Original Campaigns" of the same type) category then there needs to be established demand in the form of runs being posted somewhere (discord or a forum thread) beforehand. We generally don't add categories unless multiple people do runs of it.