I actually wanted to do planning work, but in reality, I was always busy making documents.
In the end, I was only doing paper work.
ご質問
"I actually wanted to do planning work,"=「本当は企画業務をしたかった」
"but in reality, "=「でも実際は、」
"I was always busy making documents."=「資料作りで常に忙しかった。」
"In the end, I was only doing paper work."=「最終的には、事務手続きしか私はしていなかった。」
ご参考になると幸いです。