How to create .fil or .odb files as field inputs for Abaqus?

I am facing the following situation:

From a casting analysis program I have a .ntl file which contains temperature values for each node for certain various times after casting. Basically this files has one column with all the node designations and several other columns with the respective temperatures after certain times.

I would now like to create individual .fil or .odb files for each of these time steps, and then use these files as inputs for predefined temperature fields.

Unfortunately, I am not really sure about how a .fil or .odb is supposed to be put together in the first place, so that all the values are assigned correctly...

Would be very grateful for some suggestions!

Best,

Sabin