If you're not using a wide band O2 sensor to tune the VE table then...
You need to be in closed loop so that the PCM learns the LTFTs.
Once you have collected a lot of LTFT data you need to create a pivot table in Excel (note EFILive V7 does this automatically).
The pivot table should plot LTFT against whatever axis your VE table is indexed by. For example, in the VT 5.7 commodore the VE table is index with RPM and MAP (see attached image).
To create the pivot table, you need to reduce the RPM and MAP values into ranges that match your VE table indexes, i.e. 400,800,1200,1600 RPM etc and 5, 10, 15, 20, 25 MAP etc.
See image where only the RPM, MAP and LTFT colums are left (I deleted all the others). The two extra columns of RPM and MAP labels were created using the formulas:
=+TRUNC(A2/400)*400 (for RPM, 400 defines the step size)
=+TRUNC(B2/5)*5 (for MAP, 5 defines the step size)
The create a pivot table (see image) which shows the +/- percentages you should add to the VE table to bring your fuel trimes closer to zero.
Note, you can't use this method to tune power enrichment (PE) mode because the PCM does not use/updatre LTFT in PE mode. For that you need a wide band O2 sensor.
Regards
Paul