I don't fully know Katakana yet, but if you don't mind Hiragana I believe this is it:
こんにちはこねこようど東京 = Hello Kitty Supplies Tokyo
The above uses Kanji though, as I heard it was more respectful to the country to type it in Kanji instead of Hiragana/Katakana. If you want it all in Hiragana:
こんにちはこねこようどとうきょう = Hello Kitty Supplies Tokyo
But don't take my word, wait for a professional
Because instead of "kitty" I used "kitten", assuming it was the same. And I am a beginner, still learning ^_^