Please create additional namespaces and it's respective talk pages on shn.wikibooks as follow.
Cookbook = ပပ်ႉတူမ်ႈႁုင် Cookbook_Talk = ဢုပ်ႇၵုမ်_ပပ်ႉတူမ်ႈႁုင် Transwiki = ထရၼ်ႇသ်ဝီႇၶီႇ Transwiki_Talk = ဢုပ်ႇၵုမ်_ထရၼ်ႇသ်ဝီႇၶီႇ Wikijunior = ဝီႇၶီႇလုၵ်ႈဢွၼ်ႇ Wikijunior_Talk = ဢုပ်ႇၵုမ်_ဝီႇၶီႇလုၵ်ႈဢွၼ်ႇ Subject = ပၢႆး Subject_Talk = ဢုပ်ႇၵုမ်_ပၢႆး
Community discussion: https://shn.wikibooks.org/wiki/WB:RFP#Enable_additional_namespace