You can execute the Python code below in Origin to import multiple files with extra columns for each import. To run a piece of Python code in Origin Code Builder, please check this page:
https://www.originlab.com/doc/python/Running_Python_Code#From_Code_Builder
import originpro as op
import pandas as pd
op.lt_exec('fdlog.reset();fdlog.usegroup(ASCII);fdlog.multiopen();')
n = op.lt_int('FDlog.MultiOpen.Count')
wks = op.new_sheet()
col = 0
for i in range(n):
lt_str = f'Fdlog.Get(A, {i+1});'
op.lt_exec(lt_str)
file = op.get_lt_str('%A')
df = pd.read_table(file)
wks.from_df(df, col)
wks.cols = wks.cols + 2
wks.set_label(wks.cols - 2, "Current Density")
wks.set_label(wks.cols - 2, "mA/cm^2", 'U')
wks.set_label(wks.cols - 1, "Log Current Density")
wks.set_label(wks.cols - 1, "mA/cm^2", 'U')
col = wks.cols