Inputting same data on identical Field Name on different table

currently i am new in ms access, And currently - as a trial and learning step - I created Two tables, and a Single Form that can be used to put a value to both tables, those are: **Table 1** - "Data 1", the Fields are: ID, RegDates, CatName1, CatName2 **Table 2** - "Data 2" ID, RegDates, DogName1, DogName2 **Form 1** - "Input Form" ID Registration Dates CatName1 CatName2 DogName1 DogName2 I can't populate ID on both tables using Relationships, but I cant populate nor filling RegDate fields on both Tables using one single "Registration Date" Form on Input Form How can I achieve filling both Field Name - which is RegDate - using only one single Input textbox on "Input Form"? What I want is, If I entry the Registration Date on "Input Form" Both regDate field on Data 1 and Data 2 are filled Thanks!