How to 1.add a new row to another table using the valuies of this row and 2.edit the add row

iam using this to manage dog boardings in our office,i have created a sequence of action
used to do checkin from existing customer data table A,to copy some columns to table B and later do some edits like checkin date checkout date in Table B at the same time
1.add a new row to another table using the valuies of this row
2.edit
but this action is editing data in table A but how can i edit this row in table B
please some one help

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i did not understood can you please explain with an example
1.i have some puppies in stock
2.i want to show a drop down in the column [Micro chip]when some one is filling the puppy sale form option to pick up available stock puppies and copy the rows data (date of arrival,breed,sex,and some columns how to do that