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$ cat Configs/blahblah.Config | grep ^interface

interface GigabitEthernet5/39
interface GigabitEthernet5/40
interface GigabitEthernet5/41
interface GigabitEthernet5/42
interface GigabitEthernet5/43
interface GigabitEthernet5/44
interface GigabitEthernet5/45
interface GigabitEthernet5/46
interface GigabitEthernet5/47
interface GigabitEthernet5/48
interface Vlan1
interface Vlan50
interface Vlan101
interface Vlan200
interface Vlan400

#! /usr/bin/awk -f
# awk -f findnet.awk Configs/.config > output.csv
BEGIN {
  OFS=","
  qq="\""
}

# FNR is the current record in the current file and increments each time a new record is read and starts at 0 each time a new input file is started
# edit: you probably need NR (instead of FNR) if you have multiple config files to parse
#        this prints out the header line in the resulting csv
NR==1 {print "Interface", "IP address", "Description", "IP dhcp", "IP helper"}

# find any line that begins with interface and enter
# edit: 'interface' line is the indication of the start of a new block => set flag f to 1
#         as the indication of a new block. Assign vlan a value from the second field
#         skip the rest of the code and go to the 'next' record/line
/^interface/ { f=1; vlan=$2;next}
{ print vlan }

# edit: if we're in the block section (f is not 0) AND the line/record is not empty
#        (NF!=0 or NF), enter the block lines prasing...
f && NF {

# If you find the string ip address then create variable ip and add
# edit: if 'ip address' is present on a current line... if 'ip' valiable is NOT empty, add to it
#        the value of the last (NF) field prefixed with the OFS (,). If it's empty, prefix the
#        last field with the duoble quote - beginning of the OFS-separated list
#        Same logic for the other lines to be identified: description dhcp etc..
  if (/ip address/) ip=(ip)?ip OFS $NF: qq $NF
print ip
  if (/description/) desc=(desc)?desc OFS $0: qq $0
print desc
  if (/dhcp relay/) dhcp=(dhcp)?dhcp OFS $NF: qq $NF
print dhcp
  if (/helper-address/) help=(help)?help OFS $NF: qq $NF
print help
  next
}

# got to this block if we're outside the 'block' - empty line (!NF) - see above
# print the accumulated variable from parsing the previous 'block - see above
#         (ip)? ip qq:"" => means:if 'ip' is not empty, print 'ip' followed by a double quote
#                                         (end of the OFS-separated list;
#                                         if 'ip' is empty, output empty string ("")
#        same for the other vars
{ print vlan, (ip)? ip qq:"", (desc)?desc qq:"", (dhcp)?dhcp qq:"", (help)?help qq:""
  f=0; ip=desc=dhcp=help=""
}